Damsel in distress

When you said it wouldnt turn over, do you mean it spins on starter but wont fire or it is locked up and wont turn at all?

If it spins with starter, does it make ugly noises or banging noise?
Does oil light work when key is on and engine off?
Does light go off when it turns over?

I would not try to reman a /6, they can be found for almost free, at least on West Coast. I have one that was rebuilt w ceramic coated intake and exhaust with trans and nobody will give me $500 or even offer, two others I put on CL several months ago that are good runners for $200, no calls so they are not worth much. A rebuild would probably cost close to $2000.

Keep the /6, easier for you to learn how to wrench on than with a V8 plus the swap might prove to be too much for a beginning wrench. The key is to get her up and running again ASAP so she doesnt become yard art. Evan