Well my exhaust tip is 3.5", so no problems there

Anyways, my setup? A15, rebuilt, balanced, cylinder head has been rebuilt, I just checked the compression and it's excellent in all cylinders, 145-140 psi dry, 190-195 psi with oil. I'm
using an Accel Super Coil (50,000 volts), electronic ignition from an '82 210 with a fairly new cap and rotor, brand new spark plugs. I'm using 94 octane gas. Also I've got new intake/
exhaust gaskets, but I think I might try checking some of those gaskets out. I'm gonna try to get a rebuilt kit for the SU's and I'll put new gaskets on then. As it is, I'll just have to
deal with the way it runs. Well...any other ideas? My guess is it's related to 1. Carbs/intake 2. ignition it's gotta be something in there. Thanks for the help