318 La with 360 heads

If I was doin' a 318, which I never will;
I'd go small closed chamber aluminum Magnum heads and pistons .009 above the deck for a Q of .030 with the FellPro .039 indestructible head gaskets.
Then I would figure my Scr.
Then I would select the biggest solid lifter cam that will still make 180/185 psi.
I wouldn't care how much power or how little power it made. That pressure is gonna a make a two-gear rocket, and fantastic fuel mileage, so I can drive it everywhere all the time.
She won't need much if any stall, and will like 3.23s.
Most of the money you spend on the alloy heads will be saved in re-using the TC and gears. The rest will be saved in the reduced annual fuel consumption, by not having to run a 2800 and 3.91s.
I mean you could still run something like that,....... but you don't have to.

In my crystal ball I see 10.7 Scr and an Ica of 57* @800 ft.

If I was doing it.