Long is good. At 77Kmiles you will have a small ridge, try spinning the piston as you bring it to the top so it's not sitting at it's usual spot, then tap. Can't score cylinder if piston is already at the top. You will need to hone it anyway.
First off Welcome to the forums, glad we are able to help.
Secondly, Coby is right on this. Your cylinders have a "lip" in them from where the rings have cut a small groove in your cylinder walls as they were seating. It's not a lot, but it's there, and you will probably either need to hone it out once the pistons are back out of the engine, or bore it .020 over (most engines that have almost 100k miles on them will need about that much anyways so you're right on cue
). Now, as far as getting them out, like Coby said, tapping them is not a bad idea, but use a soft face hammer that way you're not going to ruin anything else in the process. I recommend just getting new rings, but that is me. Any good machine shop will hone your cylinders, gap your new rings ad install the rings and pistons in for you, shoot, most will assemble the entire short block for you if you want them to lol.
Now before moving on, let me just ask a few questions, when the guy blew timing and bent a few valves and such, was anything else broken in there? Anything unusual in the oil? Also, did you use a new headgasket?