The most I ever got was about 310K miles in a 73 Formula 350.
The previous owner rebuilt the engine at 140K. I bought it with a bad trans at 150K miles, and replaced the TH350. It then blew a rear main seal at 180K.
I put a 75 Trans Am WT motor in it, behind a TH400 and ran it to 310K. Along the way, I swapped out the 2.73 rear end for a 3.08 rear.
At 310K, I sold it to a friend, who swapped in a 455 and 3.23 posi. He rebuilt the entire front end (it needed it badly), but within 10K miles he totalled it when a Honda Del Sol ran a red light and T-boned him.
I got my WT motor back, as well as a few other parts when it was totalled.
I got around 280K out of my 78 454 3/4 ton Suburban. The rear end went out on it.
Mike
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