Turn a small drill press into a Bore/ Hone. Bolt it to the top of your engine block & do your own machining .
I have a spare 340, that just has a few miles to many to just go back in for my taste. Would be fine as is with a Spary Bomb and new gaskets for most. But I could do a real pro job at home.
Build a cage out of old pallets to accurately hold me in position. Get a PoGo Stick, my 18V Ryobi and a dingleberry hone.Maybe I could get Uncle Tony to put me on his channel.....but who would watch......