I dont think the 2nd set of barrels are opening at full throtel? or there is no gas being dumped in the rear barrels? for a 350 it runs like a 305? specs would include 350 010 block casting bored .30 over with new minimal dish pistons, new cam with a 447 lift, heads were from the vortec 305 that I had completely re-done with a 2 angle valve job. Edelbrock performer vortec intake, Edelbrock 1406 650cfm electric choke, Malory 50K volt coil with billit distributor. New everything!