I picked up an 039 for next to nothing, but it is trashed. I'm looking to rebuild and I was wondering if I should just replace the top end, or order an entire engine that is ready to install. The Piston is scored, and the rings are stuck. The jug is scored as well. I'm just wondering if I can trust the bearings on the crank, or if I should replace it all. I looked at the flywheel, and it isn't marked up like it was rubbing the coil, so I personally think the bearings are alright. Any and all recommendations on what to do, and brands to use would be greatly appreciated.