What is the purpose of your build? Cruiser, street, street and strip? It’s more helpful to provide the cams duration at 0.050 " and the LSA. I know that the majority of the guys on here are going to highly recommend the 360 heads, but without knowing more information about your set up none of us can really provide you with good suggestions. If you're gonna just be using it as a daily driver / Cruiser then I think that using your stock 318 heads is the best way to go, you can bowl work and a comp valve job, have a 30* x0.070" back cut done to the valve's. Recurve the distributor is good idea. A true dual exhaust system, manifold will be fine too