Your 302cid/290hp (Z/28) engine block is on Ebay...
Engine pad is stamped: 18N477219 V0715MO
Block casting number: 3914678
Block casting date: G 12 8
Seller id: ohio_jim
Seller location: Toledo, OH
Seller states the following in his listing... "This car was purchased new from Wagner Motors, Wauseon OH 43567 in 1968
2nd owner purchased it Oct 1970
Engine was pulled in 1973 and in Storage ever since
The car with the matching VIN number was sold to Holland Ohio (Toledo Suburb) 43528 in 1978 and may still exist.
I tried to locate it, but was not successful
I can supply the names of the 1st and 2nd owners if you wish to search for the matching car."
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=360044107281&ssPageName=ADME:B:SS:MOTORS:1123
Paul
Sold 4-27-08...
Sale price: $2300.00
Buyer id: bruizer_1
Paul