OldSub: You're correct on the 74 and 64's number of lugs. I'm not sure on the C20, tho. It's in Texas and I'm in Utah. Kinda hard to run out and check it.
I'm just wondering what (if anything) that 87's front end would bolt up to...or ne an easy conversion for. I know you can make anything fit anything else...but some's easier'n others.