Whats It worth? Slant Six complete drive train?

Then you should sell it and buy something less original instead of butchering a good car.
Doesn’t have to be “butchering” if he takes a nice car and puts a V8 in it. I say make it your own. It’s yours. And starting with a nice car is the best way to end up with a super nice car. Rare doesn’t always mean valuable. I mean it’s not a hemi dart.