I am building a 351w engine stroked to 408 for my 65 coupe and I'm looking for some input. With the stroking, I'm thinking the revs will be limited to about 6200 to 6500 rpm max if I am correct. I'm looking at AFR heads, specifically the 185cc or 205cc models. I think that the powerband might be too narrow, especially on the street, with the 205cc heads because they are specced for 3500 to 8000 rpms, whereas the 185s are for 1500 to 6500 rpm. I am also looking at the Edelbrock Performer RPM Airgap manifold which are also rated for 1500 to 6500 rpm. I might possibly add forced induction later on down the road so I want to plan accordingly. Is the AFR 185cc and Performer RPM Air Gap combo not up to par for my 408 stroker motor? I plan to use the car mainly for street use, but I also would like to do autocross racing. I'm planning on 500 to 600 na horsepower. My main worry is that the 3500 to 8000 rpm heads and intake will creat a powerband that is too narrow, and not very streetable (3500 to 6500 as opposed to 1500 to 6500.) You guys are pretty smart, do you have any suggestions?