Can't you make the stock one work?
I had a '66 Chevelle with a PG and console, I switched it over to a TH350 and all I did was change the indicator plate, which was available from aftermarket parts dealers. Perhaps you could do the same??
Lokar and Gennie don't really make "muscle car" shifters. Their stuff is for hot rods, etc. without consoles. Try looking through the many Nova resto parts catalogs that are out there. Most can be found in Hemmings Motor News also.
