3sp on the floor to 4sp

You'll need to cut a hole in the floor pan to allow the 4 speed shifter & linkage to fit. Then cover it with a 4 speed hump from a donor car, maybe somebody makes a repop of it, or fab your own cover. I think your bellhousing will have the bolt pattern for the 4 speed trans, but not 100% positive. Pretty sure the clutch linkage & clutch assy will work.