Where can I buy a reliable remanufactured 318 for 1971 Duster?

Perhaps another thing to consider if you buy a crate/replacement motor:

Do you want to keep your original, numbers matching engine? If so, add the cost of the core to your purchase price, as you won’t be getting that back.

Given all of the people here who would dang near give their First Born to find their original engine, I figured I should throw this out here for your consideration.