Big block exh. manifolds
That's worth a try. Both my sons' cars have four speeds, so there was no column shifter to deal with, although my younger son's Dart convertible was original a bench seat/column auto (now has a 68 Hurst shifter and console).
The other two big block cars (one done and long gone and the other I'm working on now) were both originally console auto cars and stayed that way. So, I never had to deal with it. My GTS is an original column auto car, but it's keeping a 340.