['63GENIII]

While it is more work, and more money, my choice would be the 4500 / 205 setup. Mine came with a T221 and TH400 (divorced) and my 221 was starting to go. My combo is still divorced with the 205 hanging from the original crossmember and bushings for the 221 (with a few well placed holes drilled). Yes it was a little bit of work and probably not the easiest option but the 205 ('72 Dodge) was only 150$ and in cherry shape. The 4500 cost a few more $$ but was initially cheap BC I didn't know what to look for when buying and bought one that I had to rebuild.

75 - 80 mph @ 2100 - 2200 rpm and not looking for another gear.... well worth the price of admission!