this question is pretty much pointed at 1200rallycar ive got a stock a15 with a 32/36 down draught weber on it and was thinking of upgrading to suttin like twin 40 dellortos. i can buy a manifold for them for $195 brand new but was wondering how much more performance it will give me, considering the whole motor is stock did you run a 32/36 at any stage. i think i need a cam.can anyone tell me there experience with this upgrade