84 K-20 Keeper??

[twxsby]

I want your opinion. I love my truck, and I really want to keep it. I want to invest about $15,000 into it (new motor, paint etc...) BUTT, my insurance will only give me blubook in the event something bad happens to it.
I also want to know what to do with the motor. Rebuild or Crate engine? I think I want extra low end torque for towing (8000lbs) and keeping it going up the grade. Dealer is out of the question. $5000 rebuild, discontinued crate engine. What to do??