318 with 360 heads and compcam build help

CLAY72dart said

273 numbers are
2806030-1
Also has 2/25/66

Heads are what looks like
2843675-12
P
Has a 1.78 intake and a 1.5 exh

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block could be 273 or 318. What bore diameter? Maybe a thick wall 318? On the other side of the bock say 273 or 318? 675 heads are 68 up 318 open chamber heads, no joy there.