Ted I'm not sure what intake manifold you are using but you may want to do so research on it. I was really shocked after flowing a couple on the bench this year to find out how restrictive some are. I ported a set of chevy dart platinum heads this summer and when we bolted his intake on our numbers dropped from 308cfm-268cfm. After some intake work we were at 300. After seeing that I checked my small block super victor and W2 victor. I will never bolt another intake on an engine out of the box again. The best way to have it checked is with it bolted to your heads, and ask for before and after numbers. Post your head and intake combo and maybe one of our members checked one out.