Wow nice project. I dont know if you got your frame done yet but I had the same problem with my nova on the mounting holes. I bought a kit from year one to fix them and then took my frame to Nicks on 322 in williamstown and had him weld them on. When was assembling the front subframe for the nova I put the engine and trans in place first and then up the subframe back in much easire that way.
Herea a link to my photobucket mayeb some of the pics can give you some ideas.
If you need any help on the project let me know Im not far from sewell
http://s146.photobucket.com/albums/r...evy/72%20Nova/