Lemme see...
When the clutch is engaged, the motor spins the tranny shaft at the exact same speed.....
Ya really want to hammer power to a 30+ year old transmisson designed to spin at about half that speed with NLA bearings and a problematical intermediate plate?????? Balance of driven components is gonna be critical...
Did I mention the CV joints moving at 2X velocity????
That engine is probably a gutless wonder at low speeds.....