In too learn. I have never run aero on mine. Three others that I know, long time racers of 1st gens, one stock chassis and other two full tube. They ran splitters. They also ran on full sticks. I could ask for a measurement.
There are class limits in SP - front aero is limited to between the front of the wheel opening and the front edge of the bumper and the outermost edge of the side bodywork, rear spoilers 9' tall and must not extend past the outermost edge of the bodywork.
Seems to me you would max out the front and adjust the rear to balance.
I've run a rear spoiler for years - ever since I tried a suction cup one a friend used. I was coming around a sweeper noticeably faster than I previously had (spectators confirmed this) when the outside section came off. The car immediately spun. Spectators confirmed this and the photographer captured about 10-12 photos in sequence.
Might be the reason I've run 500-550# springs in the rear. DGATW suspension calculator recommends 400#, but the car understeers badly. Hoping maybe a frojnt splitter will balance that out.