Brian,
I am trying to conjure up some ideas to improve a great engine / vehicle. I am not selling this car. I want to intelligently / practically / "bang for buck" modify it.

I'm just looking for ideas here guys.

I have some ideas, like a modern quick spooling turbo with a big downpipe/exhaust.
Maybe a tranny swap. What other engines have the same bolt pattern as the 617?
Maybe a differential change. Maybe propane injection. I don't know I want to hear everyone's ideas and I want to discuss. I think there is some serious potential if you think about it?