The mounts in your first picture are the same mounts I had on my 76 Ramcharger 4x4. The hole in the side of the RH mount was to make room for the oil pump relief. I have those same mounts for a 440 I put in a 1979 W200. I wound guess they would be fine for any 70's 4x4.
The straight mounts I have seen for motor home 440's, but have no experience with the 2wd mounts, to know if they're the same.