Need help rebuilding SBT engines. Short story to this rebuild goes like this: I bought two rebuilt SBT 717 engines and two rotary valve covers and rotary valves for my 98 Sportster 1800. I broke them in per the instructions giving to me by SBT tech dept. I lived in Alabama at that time and prior to replacing the original engines with these crap SBT rebuilts I never winterize the engines since it rarely gets to 30 deg F in winter and never had a problem. So I broke them in then had to put the boat in storage since I had to go overseas for a year, when I returned I tried to fire up the engines and come to find out they were locked up, rusted so bad I cannot imagine how a fresh rebuilt engine after just being ran for no more than four hours to break them in got so rusted out. See pictures posted. The gasket surfaces between the piston bores and case halfs are severely pitted in my opinion. My question is, should I clean up these case halfs and reuse them or junk them and get good clean ones with no pitting? Also the case half's and piston bores had some kind of sealant between them in addition to the paper gasket, my understanding is that there should be no sealant used, just the gasket and when I looking at the service manual it doesn't specify and sealant just the gaskets. I'm wondering if the pitting in the case half's has anything to do with the engines not sealing properly and rusting out. One more thing to mention about these SBT rebuilds is that, one of the engines has the pulse line port on the magneto side and the other engine the pulse line port is on the PTO side. Both the original engines had the pulse line port on the magneto side next to the fuel pumps. The rotary covers which are also SBT rebuilds are severely scored and were installed at the same time the engines were replaced. I bought a top end kit from fullbore and the cranks look good no rust, just cleaned them up really good. The issue I think is the case half's with the pitted gasket surfaces. Sorry if this post turned out to be a bit lengthy but I feel I should mention everything I noticed that is off about these SBT rebuilds. Any help with rebuilding these engines, guys, would be greatly appreciated! since SBT ripped me off of about $2500 for the engines and rotary covers I'm going to do the rebuild myself. Thanks in advance for the help and advice on this rebuild!