With the thinner gasket you would have .054" quench... not enough to help much. Also compression too high for pump gas/iron heads IMO.

It is a lot easier to fix now vs later. Best I think is to remove some material from the pistons to lower CR to higher 9's (contact manufacturer for feasibility) or change the pistons to a small D dish. A really thick gasket (head saver copper shim?) to lower compression under 9.5 would be a non-quench alternative.