How far in the hole 318 pistons

This probably won't be much help to you as this motor had been apart a couple of times with a 0.040" overbore, but on my 1973 casting 318 the pistons were about 0.070" in the hole. The block had been decked before but I don't know how much was taken off. Factory pistons could of had a higher or lower compression height than the replacement pistons that were in it when I pulled it down. Also maybe worth noting is that the "fireball" 318s were supposed to have slightly taller pistons in them.
I would be pulling a head off to check for sure, but if I was going through the trouble of a roller cam swap I would definitely be swapping out the factory pistons.