What cam to use in a 318

Those are fairly obvious observations.

If you use 1967 pistons (and change nothing else) on an 8.8 engine, what is the new compression ratio?
If you use 1986 pistons (and change nothing else) on an 8.8 engine, what is the new compression ratio?
If you use 5.2 Magnum pistons (and change nothing else) on an 8.8 engine, what is the new compression ratio?

If you use 1967 (920) heads (and change nothing else) on an 8.8 engine, what is the new compression ratio?
If you use "302" heads (and change nothing else) on an 8.8 engine, what is the new compression ratio?
If you use Magnum heads (and change nothing else) on an 8.8 engine, what is the new compression ratio?

...and the several other potential combinations.