Late model Taurus SHO or Cop car. Turbo V6 all wheel drive. Good parts availability. Ford in a Ford.
I was thinking this would be the drive train for my next project, but I am glad that GoodGuys pulled the plug on AWD. No way can a rear drive full bodied car keep up with a short wheelbase AWD T-bucket. Now I can focus on the car I have and my driving for next season.
No matter what, you've got a long road ahead of you, but if you're set awd, find an old Syclone or Typhoon and do what you gotta do to make it fit that '65 chassis.
Good luck. You are a braver man than I.
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"I should have just started smoking crack. Its just as addicting and WAY cheaper..." --unknown