STOP!!!!!
ok guy, before you go running off and buying all these parts they are telling you to get and start mix and matching things together, it is important that you share your GOALS with us.
from your original post i understand you engine was ticking an knocking, and you were rebuilding to fix that. in this case, you will not be really ADDING much performance. you are more bringing the engine back closer to its original condition. you DID however say you were shaving your head, which will increase compression and give a slight increase, but unless you are shaving alot off, this is not enough to really make a huge difference in power or necessity for further air/fuel induction beyond stock.
as euphoricblue pointed out:
There isn't really any power to be made at the carb unless it's restricting flow. In stock configuration they do, which is why you get a noticeable difference when you disable the fuel economy and "automated" devices. After that is done your gains from tweaking the carb become minimal, it's time to open up the head. After the head is opened up then you go back to the carb (Enlarge ports/replace with bigger carb) This is mostly why there isn't a huge difference to be seen between a Webber and a stock carb, on a stock head.
read that, and then go back and read it again. you will not see any noticable gains over a stock carb with a stock head and stock compression ratio.
many of the people here have told you to go get a Canadian carb and intake manifold. their hearts are in the right place, but this not the only way to skin this cat. yes the CDM carb and IM will help eliminate CVCC... but do you really want to eliminate CVCC? do you even know what CVCC is?
the only thing anyone has told you is that CVCC is better for economy, and no CVCC is better for power. but, are you opposed to gas mileage? i dont think anyone here is. how much power do you gain from losing the CVCC? this is something i have yet to hear anyone really tell me.
as a matter of fact i am gonna have to challenge the idea that CVCC is "BAD" for making power. my argument being the EW5. the EW5 motor is a JDM variant of the fuel injected SI motor that had 16 valves, 4 of which were cvcc! IIRC the HP rating of the EW5 was 108... which is the same as the 91 SI engine. thats 17 HP over the american EW engines without CVCC. where does this extra 17 hp come from?
back to what you are trying to do with your car. im going to hazard a guess that this is meant to be a daily driver, and not a track machine. you are rebuilding the engine with factory internals, and slightly shaving the head. in this case, you will gain almost nothing by changing carbs. (CDM or weber) with either you lose CVCC and fuel economy, and change the way your engine runs. if you want an explanation of the CVCC let me know and ill find one for you.
another issue that no one really touches on when doing a CDM carb swap is, what if you have to rebuild it? now you must source a CDM carb gasket set! now you are adding more hassle to your car! and talk about hassle, get a webber! now you have a carb that did not come tuned for your engine! i have not heard of a single webber swapped car that didnt have a DRAMATIC decrease in fuel economy. its hard to go fast when you're out of gas!
im not sayin DONT do it, im just saying KNOW waht you're getting into! a webber is GREAT carb! but without engine mods, and the knowhow to tune it.. you are gonna be in a world of regret.
as captain regular said, your stock carb can be easily modified to be as simple AND as powerful as the CDM carb. there are many writeups on the subject. combined with the darkhand manual secondaries mod, this will really change your carb into a new animal (unless your carb was running REALLY good in factory form, which i have NEVER seen)
the rebuild kit for your factory carb is cheap and easy to do, so if you are unsure of its condition at all i recommend it. this was the first carb i ever rebuilt and it was pretty damn easy.
anyway, before you go purchasing all this stuff, PLEASE put your engine back together and devac your stock carb and try it. it will not cost you anything to try the your old one, and if you feel you need more after that by all means. but just try it before you go spend money on carbs that will gain you almost nothing but more hassle