Mike, yes there is a spacer to put on the front so 1 of the dished dually wheels will mount on the front. I see them on eBay from time to time. And I'm not too sure you have to install longer studs on the rear. Don't know really. Those old trucks were made with narrower wheels and tires than late model trucks - I think the shop manual shows a rear tire center distance of 9". Some modern wheels will be dished deeper than that. They may bolt-up but the inside tire may rub the springs. The 3800 (1-tons) of that age had 7.00-18 tires. That 64 probably has 16" - but may work OK. Good luck and keep us informed.
