Have you installed the 3.27 axle yet? If you have, you sure won't want to stick a 6 speed trans in there with it. In fact, I think a 6 speed is over kill for a car that has a high RPM engine like a pagoda. There isn't much of a torque band below 2,500 RPM and all of this high gearing will keep your engine speed too low at a normal road speed. My ZF runs around 3,000 RPM at 60 MPH.
As long as you have places where you can drive 80 MPH without being pulled over then maybe........