Small claims will work, but what you need to do first is send him a letter that basically says "do the work or I sue you! " I think the formal name is "demand for contract compliance" or something like that. And give him a reasonable amount of time, like 14-21 days.
Refund the money plus towing charges so you can take it to somewhere else and you don't ask for damages for wasting your time, or else you'll sue him for $1000 plus holding your car hostage, which , even if you just charge $1 a day is a good amount of money.
Then when you go to court produce all the demands, including the letter, the canceled check (prove that you DID pay him and the money already came out of your account), proof that the truck is at his place, and so on.
Small claims court would probably award the money you paid and demand your truck back so you can take it elsewhere to be repaired.
Hope that $1000 didn't include the cost of the new motor. If you provided the new motor ask for it back too.
You probably should tell the mechanic what your plans are. No one wants to go to court.
Send a simple letter stating the day you plan to go to small claims court. He won't want to go to court so will probably get busy. If you do have to go to court notify the proper regulatory agency of the bad habits of a business.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.