['ol Pinion head]

Charlie,
When you get to mounting the aftermarket Hurst shifter to the Muncie, it will mount higher & forward of the factory shifter & will probably require notching your floorpan cutout. Have run across a lot of stick early Birds with the notched floor pans in nearly 20 years of dragging in parts cars & junking.

The factory '68-69 Firebird Hurst shifter mounted on a special shaped steel bracket that positioned the shifter rearward & down low. It also used the longest shifter rods of any regular length (non big car) Muncie 4spd. Went through this when aquiring the correct complete shifter & mocking up both versions for comparison. Wife has 400 4speed convert (mothballed project) with console.