Z/28 engine block is on Ebay...
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=380167503143&viewitem=
Engine pad is stamped: V0926DZ
VIN stamped on pad 19N515945
Block casting number: 3932386
Block casting date: I-20-68
Seller id: terry_rosebush_motorsports
Seller location: Bay City, MI
No sale 5-5-10...
Reserve not met = $3799.99
Paul