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

There is no way I would pay anywhere close to that much money for a remain or long block. Seriously 318s are dime a dozen anywhere you look get one off market place or your buddies cousin for 50 bucks and go thru it clean it up even if it needs machine work your still under a grand and you will have a brand new motor. I started with a compete disaster 360. It was bad there was guys on here telling me to find another core! I have 350 in machine work 400 in pistons probably 400 in the valve train (cam lifters springs) 250 in the crank. And that was all performance type parts your not gonna get that in a remain or long block. You could stick with stock replacement stuff and get by ALOT cheaper! All said and done I have around 2 grand in my 360 and like I said it was performance inspired. You can build a budget 318 for less than 500 if you source the right core and do some smart shopping.