Schumacher mount question

Should be left side only, if that is 73 and later slant 6 to v8. The left side was tall for the slant 6 and you are cutting it down and drilling to a more useable location. I don't recall any modification to the passenger side when I did mine.
I did 73 and later slant 6 to B/RB, but now I put in a small block 360 without having to alter the previous modification, just using the different mount kit.