Shifter should be for the body, 66 Valiant. I prefer the original A body 64-65 Hurst. It has a bolt on handle. It may be perfect as is. There are some on eBay now or I have a spare I would sell. Use the later 6350 aluminum mounting plate, O/D rod set from Brewers, the stock A body reverse and 1-2 lever arms, and the 065 O/D lever pointing down for 3-4 position. I'll upload pictures later.
