TTI exhaust early A-body instillation ?

Here is what I have found. I think the RH mount was not sitting were it should do to it only having two bolts. This is what I posted on the early A-body section

(I think I may have found my problem. Right mounts, wrong engine. Looks like the 273 had the twin ears (two bolt holes) on the back on the RH side, and the 318 has the twin holes on the front on the RH side. Correct?? Curious what others have done about this? I am thinking about welding a piece on to the bracket to line up with that hole. Any ideas?? Thanks!!)