714 head valve stem height issues

I purchased a set of 714 casting heads from a 1990 p/u to put on my 74 318 in my 72 dart. I'm currently installing new springs to match the cam I purchased that all came in a kit from COMP. I've got two of the cylinders on one of the heads done with the new springs when I noticed the height of the stems are different from intake and exhaust the same amount on both sets. They were the same way with the stock springs before disassembly. No valve job but a hand grind to re-seat the valves. My question is can I use the stock valve train with my new cam .454/.454 with no issues? If it worked with the '90 block it should work with the '74 right? Thanks for the help.