If the drive-shaft get's to be too short, it get's hard to find a satisfactory driveshaft angle that will nullify a phase vibration, especially with soft rear(street) springs.
Having said that, I bolted a B/E A833 into my 68 Barracuda. (I know it's not a 1st gen, but..) I had to fab up my own shifter mounting plate and also new HD shift-rods. Since I had to do that, I decided to pull the shifter way back between the buckets and really high up. The top shifter bolt goes in from the cockpit.Now I can put some real power into the short stick. Missed shifts are history.I'm not going back to the A-body tailhouse, ever.
