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FWIW when I was selling an extra motor I aquired everybody asking about it was interested in how many times it had been overhauled. Their opinion was anything more than three times and the case is suspect.
My mechanic, remember he's a cranky 70 year old who was chief mechanic at Whidbey Island NAS (and can prove about 200 o-200 rebuilds from his logs), said that after about the 3rd rebuild the case fretting and resulting resurfacing leaves the case unusuable. If that doesn't happen, the resurfacing of the cam bores (no bearings remember) makes that unusable. He said he's never seen a case beyond 7 uses pass overhaul inspection at the machine shop. Genenerally they fail at 4th or 5th overhaul. All this depends on the previous assember to pay attention to case mating and proper torque of the bolts to reduce fretting (the two halves rubbing together) to a minimum.

Your mileage may vary of course. Mine is newly on the 3rd overhaul and I don't suspect I will ever see the 4th.

My old engine had about 6,500 hours on it It needed an overhaul (low oil pressure, metal in the oil, etc.)

The logbooks were incomplete/had missing data. I figured 6,500/1,800 meant at least three overhauls in its history. I didn't want to mess with it, so I bought a brand new engine. I got mine for $19,250. Pricey, but I love the way it runs, and I don't worry as much while flying.

Those prices apparently are long gone, but I still know the guy (formerly from Mattituck) who now works at Continental. If anyone wants to go the new engine route, I can give you this guy's name/email and maybe he can work out a deal.

I have a 66 150 that i am going to do a engine conversion on in sept. will be selleing everything firewall forward including mount 1400 since major 200 since top