If it’s a real MK55H and not a clone, the engine had some special high performance parts supplied by the factory when it was originally assembled. The crankshaft should be the one with the smaller (-.002") crank pin journals. It came with a light flywheel, and Carter Model N carbs. The one valuable component would be the racing gear case. If the gear case is in very good order, it, by itself would be worth more than $1000.00. Nobody is making any mor MK55H gearcase housings, although all of the internals are available. (aftermarket). Someone will be interested in purchasing this engine. The market is less urgent, but there are folks inerested in owning vintage racing equipment. R.T.