FWIW whether they have been milled or not is less important than the final chamber volume, measure them now & cut them to obtain the volume you need to get the C/R you want...

BTW .0062 off the deck = 1cc & for every .010 off the deck cut the intake surface of the head .0123

And BTW John is absolutely right.. Blueprint spec isn't even close to what Mopar really supplied.. 88cc happened allot less than 91-92cc