I have run both od's and straight 4-speed in a couple different mopars over the years.
3.91 gears and highway, I would use the od, you are really going to hate the trans ratio, but you have enough motor to compensate.
I actualy think driveability is better with 3.23 and a straight trans, because of the better trans gear ratio.
Centerforce clutch, just use mechanical linkage, the cluch requires very little effort to push down.
You are going to have fun getting that lakewook bell in the car, it requires some cutting and beating of the firewall. Plus they are hydro formed so they are really not that square.
