Chamber size for iron head stroker

My project keeps changing. After being mothballed for a few years, I've gone from planning a "junkyard magnum" to doing a stroker. For those who want to see more detail on the project it is here with a post titled "The Frog Wants to be Stroked":

Project Frog Princess

I have RHS heads from IMM, 62 cc chambers to match original pistons (dished and .050" below deck). I cc'd them and got more like 61 cc.

I believe I can order a SCAT stroker kit with dished pistons (around 26 cc) to get me to a pump-gas friendly 9.5 compression ratio, according to the seller specs. I am not sure if those pistons are below deck? No spec given. Feeding the numbers into a compression calculator it seems they must be.

My limited understanding of quench suggests I may be more prone to detonation with a dished piston. My gut says it's not likely a big deal since the factory runs 0.50 below deck at 9.5 compression with leaner mixture than I will likely have, using a carb. Of course if all these strokers are well below deck, maybe quench is a non-issue.

Is there a performance loss? Again seems unlikely to be significant but I'm not sure.

If I were to sell the RHS heads I'd likely go with aluminum with similar flow, set up for a flat top piston with compression 10.5, and presumably better quench. My loss would be the discount for re-sold heads and the shipping cost since I think I can get aluminum (checked/prepped) for around the $1650 or so I paid for the RHS set with shipping.

I'd like to understand it better to decide on keeping the RHS heads.