On E-Bay not mine lists serial # http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33615&viewitem=&item=110162738170
He reused the original cast pistons on the rebuild. New pistons are not that expensive relative to the cost of the engine. The engine is cosmetically very nice.
Non Buick carb, Valve covers painted not chromed? Is it really an SS or a restamp. I would wonder about this one.