I have a spare 2.6 m103 with 140,000 miles in my garage, the motor that Im working on has 205,000. I was thinking about putting the head from the spare motor (140,000 miles) on the bottom half of the motor (205,000 miles) that is in the car now. What do you think? Or I also thought about just putting the spare motor in the car, I know nothing about the spare motor. The guy I bought it from told me it had 140,000 miles and it ran.