Very bad shape casting, but looks like it might be C2 "?" 8... maybe a "1" so March 21, 1968?
But I got I real close last night and I think I'm wrong... starting to look more like a typical 9794234, not 878... Hope I didn't waste anyone's time...
'68 400HO Coupe, 4 spd, 259 interior, Windward Blue. My other car's a Johnson 15 outboard on a '61 Starcraft rowboat... Just sayin'.