It’s no wonder the motor runs like crap!
Assuming your 6X-8 heads have not been milled I get a total CC volume by using the rest of your numbers, plus the head gasket volume that your missing of 9.4 CCs, your total is 123.8 CCs!!
Your compression would then be 6.7 to 1, yikes!
Put on those other heads right away if they have been gone thru and are fresh.
If your using a late intake manifold you will need to run the right intake gasket to seal up the bigger exh crossover in these heads as compared to the 6X heads.
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I do stuff for reasons.
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