There can be many reasons for excessive heat including running too lean and a clogged flywheel (the fins on the flywheel act like a fan to cool the cylinder). If they are not free of debris, they will not work well.
Sounds like that 461 got very hot. Make sure the cylinder is not scored and none of the rubber is melted.
Also, if you are planning on running 28" full comp in Ozzie Hardwood, I would want it to be ported.