Your small block engine block is on Ebay...
Partial VIN stamped by oil filter mounting boss: 19N631252
Block casting number: 3932388
Block casting date: C 24 9
Seller id: janneller123
Seller location: Clarinda, IA
Seller states in listing... "The suffix code is gone or was never there or the block was decked I did not want to do the acid test for fear of block damage,The Zs original VIN number can be easily read on the side of the oil filter boss"http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=320537273005&ssPageName=STRK:MEWAX:IT