318 with blow by

im getting blow by on my pcv valve i shook it last night make sure it was working properly but i think i might of shook it loose so that is it seemed to be free moving instead of stuck. but im looking for if anybody knows know the compression for the 318, i want to test the cylinders make sure they are up to par but i cant find what the number should be?! guess im just trying to figure out how big of a spring project ill have when i give the motor a make over.

thanks.
swingerwoman.