goin' V8

I am in Calgary. Both the 318's i have located are in the 3-400 range with tranny.

After some more research, 86+ 302 heads are considered desireable. I am not sure if they are supposed to be used on an older block, or if it makes a difference. I am planning to build a low end grunt type set up instead of a High RPM HP type. probably a dual plane manifold with a 600ish CFM 4bbl carb.

I read somewhere but cannot find the artical now that Durrango exhaust manifolds can be used on early a-bodies for increased flow. Has anyone tried this?