The Evo1 gearset uses the 1990 Intermediate gearshaft. The last thing I would want you to do is drop a 1991+ style Quaife onto a 1990 Style intermediate, and destroy both the center and intermediate. Is the Quaife you got there a 1990 style?

1G DSM: 1000+ AWHP, 9.2@162.83 MPH
Evo X: 746 AWHP, XR9569S pump gas
www.dynotuneracing.com