Use a table ban saw to hack off the 340 piston crown .

Ok now we are getting somewhere chewing gum, add in some duct tape, and coat hangers. That should get it done.
1685220614464.jpeghttps://www.lowes.com/pd/Dow-GREAT-STUFF-Big-Gap-Filler-20-oz-Spray-Foam-Insulation/3369676

Sorry, I don't mean to be disrespectful, but I can't resist. Personally, I don't see any point in today's time, as to why someone would try to cobble an engine together with improvised practices.