Well, it looks like we have something else to get manual parts off of, '66 & '67 GTO's. Can't see how this would fit a 1st gen A body let alone mount to a Muncie. I would say maybe the Hurst shifter itself might be the only part that would fit.

1966-1967 Pontiac GTO 4 Speed Hurst Shifter With Linkage | eBay
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