John is exactly right, and in order to get the "lots of paperwork", you'd need to do a lot more. To be honest, if you truly want it "certified" and there is ZERO paperwork regarding the overhaul, then I know that we as FAA certificated people/shop wouldn't be able to do anything with it except tear it down and start from scratch. That means verifying EVERY part in that engine, inspecting it for airworthiness, and replacing a good deal of parts beacause you need to when teardown (rod bolts, etc...). Simply doing a cursory inspection would not legally suffice, although you may find someone of dubious character to "make it correct" on paper. This also isn't limited to the big parts of the engine, but things like plungers inside the tappets, valve spring retainers/washers, pushrods, etc...
Then, on top of the core engine, you need to literally do the same thing with each accessory that you have zero paperwork for - and in many cases it'd probably be cheaper to buy a new unit (like a mag for example) instead of tearing them down for inspection/verification.
In the end, unless it comes from a reputable shop or person I'd just stay away or consider it a core. That being said, your assumption that an engine needs to be 'certified' to increase your chances of finding an engine isn't necessarily correct. There are plenty of high quality shops/individuals that will do an overhaul on an experimental engine at a level equal to or often times better than a base level 'certified' version.
My 2 cents as usual!
Cheers,
Stein
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