squish on a 5 mil stroker?

lowered the comp on this motor with a diff mrd head slab,squish is right around 50 with a stock head gasket. Stock gasket looks to be 53. I have a couple copper gaskets that are about 22 to 23. would this be to narrow a squish.

Aprox how many pounds of compression would be gained going from a squish of 50 to 22?
 
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