I don't have it driveable yet, but I mocked up the 4 speed for my 80 Mirada. I needed an F body floor hump, pedals, Z bar and pivot, and clutch rod. The trans, shifter and rods are '69 A body. It's pretty much a bolt in deal, the floor hump fits perfect and the hole for the clutch rod is already in the firewall. You have to modify the pedal bracket a little to accept the clutch pedal and reinforcement, and drill 2 extra holes in the firewall but it's no big deal. I may modify the shifter a bit as it's a bit close to the dash in 1st and 3rd.
For now I'm just going to take the shifter out of the auto column, but I'd like to get a floor shift column eventually. I bought a new carpet set that I'm hoping will be wide enough make up for extra the floor hump width too.
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