Anybody using a B/E body 4 speed in their A body?

Yep I have one in my 68 Barracuda. It was a very easy swap.

One of the bosses on the front shifter mount comes awful close to the torsion bar cross member and in my case would just touch during right turns and send an awful vibration through the car. You can either dent the area for clearance or do as I did and cut the boss off.

In regards to relocating the shifter if you use a good stiff piece of material I can't see it flexing enough to be noticeable. I used 1/2" thick aluminum plate. I have no noticeable flex. BTW, the shifter winds up in the stock location and you use stock A-body rods.

I don't recall the exact dimension but I had to have the drive shaft shortened about 3"+. I measured the length of the 3spd I was removing and the 4spd and used the difference for tha amount to shortend the shaft.