thanks, the engine doesnt have a carb on it yet, all I have is a little 650 from my old motor. any recomendations on what size I should buy? its a circle track cam Herbert cc6c 4500-8500rpm .625 lift 275int/285ex @.050. 2.05/160 heads. I have a good free flowing exhaust. would a 900-950cfm 4150 carb be ok? or should I step up to a dominator?