As an easy first step,, remove the intake side covers. Poke at the rings to see if they move. At less than 50 psi, something is wrong. Is the paint discolored from overheating? Removing the exhaust cover will let you look for hot-side piston scoring. Yes, you can reuse the dry-installed head gasket if it hasn’t been run. I use OMC Gasket Sealer on them.
