Car looks and sounds amazing. for sure 80k miles is worth restoring to original condition even if it has some top end engine issues. You did want a car to thinker a bit didn't you!?
I might be wrong but 195 sounds way too high. But more worisome is the difference between cylinders
There are borescopes on amazon that you can buy cheap, not for 10 (not € at least), I think, but for 20. There are essentially 2 types. The cheapest ones, the ones you hook up to the smartphone that use a proprietary app that by all accounts is pretty shaddy in terms of privacy and data access. I heard with some thinkering you can use them with other apps, but don't quote me on that. Then there are the stand alone units, which have a ****ty display that has the boroscope attached to it. Most of them allow to record to a micro sd card. Most will claim to record full HD but no borescope costing 20/30€ will record HD. So the image is actually 480p at best. Is it good enough? Most of the times yes. If you are not in a rush and keep the camera steady for a bit while recording, then you export the files to a decent size computer monitor, it's alright.
If you don't mind cheesing the system, you can use amazon's "mislabeling" (they know what they are doing. they know most people wont check if the files are 1080p) to return the item for being falsely advertised. Basically any 20 to 40 bucks standalone borescope that claims to be "Full HD", "1080p", "2k" or "4k", won't. So you can order one, check the cylinders/valves (they have a mirror camera attachment that allows to check valves easily), export the files to a computer and return the item to mister Jeff.