I went to my buddy's parts store the other night as I'm giving some thought to buying a stock, reman. SBEC, computer for my new 360. Looks like the after market offers 8 or maybe even 10 different part numbers worth of computers for the 1990 model year alone. Has anybody got any idea why so many choices? Of course there's the Lockup vs non-lockup convertor, high altitude version, and the California emissions version, but what are all the others specific to?? Have any of you guys cracked the part number code on these things? Can anybody tell me which one, (Part number wise ), offers the best possible performance capability? I live here in the Northeast at sea level. Help??