Wow, Thats not "Tweaking!!".:read2:
Thats Fabricating and Welding, and Rebuilding the part; to make it fit.
[Nice work]8)
{thats way more involved than anything that I am capable of,
and I removed my 273, and installed a 318 that I had rebuilt myself}
Tweaking is having to grind 1/8th inch of metal not narrowing 1.46". ;)
DionR
factory dimensions show the frame width difference as 1.46 between the early and late A-Body,