So your saying your block is assembled Already?
The way Edelbrock got to the bigger chamber size they offer is the same route that the factory took, they machined the chambers deeper and used shorter valves.
In terms of making the best power and efficiency your better off with the 72 cc heads and dished pistons to get to your compression ratio you seek.
Also the deeper chamber heads can not be ported to the same level of peak air flow if your looking for such.
This effect is due to the reduction in short turn height in the ports of the bigger chambered heads.
If you can’t rework the pistons because the motor is together then I would first see if I could sell those heads and buy the larger chamber version.
Basically making a chambers perimeter bigger to gain volume will only server to increase the motors propensity to ping and knock.
This is a main reason why the deepening of the chambers is the way to go to drop your compression.
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