318 budget build

closed chamber heads; plus
.028 gaskets, plus pistons .040 in the hole makes a Q of .068; smack dab in the middle of the no-go zone
Do you think this will be OK with OP's stated 9.18Scr and the
Oregon 1006 ;260/264/110+2/ cam? nice cam btw for non LA heads; with42* overlap,works better with headers

Ima thinking

Static compression ratio of 9.18:1.
Ica of 58*
Effective stroke is 2.70 inches.
Your dynamic compression ratio is 7.66:1 .
Your dynamic cranking pressure is ........................ 153.17
PSI.
V/P (Volume to Pressure Index) is ......................... 119
FWIW.... Ima thinking:
- your DCR numbers are close, not super high
- the closed chambers are going to help him some.

He can always work on the ignition timing with this if any problems show up IMHO. And if he pushes the LSA out some that is gonna lower the DCR.

Not sure what the stock cam was, but this engine ran OK from the factory as it is, with the heads and SCR.....maybe a slow advance curve?