I found a 91 explorer lx loaded with 151K and it is in great shape but the motor has a bad valve and posibly a piston gone bad. This info is from the owner. What my question is, they want around $1500 for it but I have never priced out 4.0 v6s, is tis a good price. What I have planed for it would be leave the 4.0 and auto in it and swap in a d44 and 9" out of my old 71 bronco. What do you think? Thanks in advance.