[Ol' Ron]

I'd use a setof cast iron heads, angled milled .070". Check for vale and piston clearance. A die grinder can clearance the areas with less than .050". This will raise the CR aprox 1 point. improve torque and economy. these blocks are quite thick and can be bored out to use 8BA pistons, for 239ci and another increase of compression. very nice engines.
Gramps