Welcome to iRV2.
Sorry you're here with problems .
I'm not 100% sure on the camshaft differences between your 95 RV and the trucks of that vintage , but engine mounts, exhaust port spacing and bell housing should all be the same. I've heard that a change of the 460 into a vehicle that came with a 429 was a straightforward swap, so I'm thinking Ford didn't change much over the years.
Had more involvement with 260/289/302/& 351 C than the big engines , I'll check around to see if I can get exact info.