/// Another Bunch Of 273 Commando Rebuild Questions? ///

Bossanova5 said
The goal is to make it a great running reliable street engine without spending a fortune.

The compression change for this application, is relatively meaningless. 3cc on a 10.5 engine is worth a half a point of compression.
At WOT, from zero to 60 mph, I doubt you could measure the difference in ET.