My 71 Mustang with 302 grew tired at 156,000 that my daughter was driving, and I was real busy at the time, so I bought a long block(rebuilt)and put it in. It was cheaper and quicker than rebuilding my old eng. I kept it though for future considerations. The reman engine now has 65,000 on it, but one head had soft valve seats and had to be replaced at about 50,000. The other head was ok. Guess the rebuilder didn't use hardened seats. Otherwise it doing ok. Doesn't use any oil and has good power.
65fastback,71cpe,73cpe,05GT 5sp