I re-ran your info about your motor again since I had assumed a 4.210” stroke and not a 4.250”.
You need 99 CCs of total volume above your pistons for a 10.5 compression.
The usage of a Fel Pro 1016 gasket with its 9.4 CC volume knocks down that 99 CCs to 89.6 CCs.
If your pistons only have two valve notches then let’s call that 5 CCs.
Now for all practical purposes your right at the 85 CCs chamber volume that you can get that are made.
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Now you have your 10.5 compression ratio .
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