318 with 360-587 1.88 heads

72bluNblu said
Since the heads are off of it, rotate that sucker over to TDC and measure how far down the pistons are in the holes.

Could I use my 63cc RHS heads?

Measure how far below deck the pistons are. If they are at .080 like i ran the numbers, even with the 63cc would still only be 8.4 to 1.