Ahh, changed yer name... very cool. If the crank, cases, jug, are OK shape I would definately do a rebuild. Your basically talking bearings, seals, gaskets, piston/rings, rod kit (wise upgrade if yours is janky), fluids and some labor. Not a bad investment for a solid no worries powerplant. You can get some porting and extra power out of her at the same time. Good luck.
Sly