Thanks guys I really appreciate all the info. Plenty here to make my choices. The biggest choice I see is whether to swap out the heads. 4bbl, cam, headers, ignition
If I decide to swap the heads for 360s how much should I mill off?
I bet stock 360 heads would gain at least 30 hp over stock 318 heads if not more. 318 heads are basically 273 heads which even for a 273 they limit power.
I've heard 0.040" is enough but I'd double check that plus it depends on what head gasket thickness you run.