LA360 compression
if your gonna go all that trouble $$$ , I don't know what it cost but now the builder tearing your engine apart so rebuild then milling the decks .100 cost more than a .02 cleanup now you got to mill the intake or heads so the intake fits etc.... at that point just buy pistons.
If you can afford it rebuild with right pistons then do that, but if you can't and gonna make your car sit around for a year or so just put it together. A running and driving is better than a project that ends up never running again cause life happens.