The 300 Inline six is a common engine,,,you can find a donor vehicle almost anywhere,,,they will usualy go over the clock and still stay strong,,so dont worry so much about buying used,say,,$250.00,,,if you need confirmation on this,,,,ask any of the 4X4 guy's who like playing in the mud,,,they will tell you the same thing,,,,,,they are one helluva strong motor, even with lots of miles on them.