Had a fella want me to come look at an engine before he put it in his race car as he was told it was out of a Corvette. Block number 3969854 dated D 7 7 stamped EG on the pad with big outlet above the oil filter.EG comes up 66-67 Chevelle but they never made a 854 block untill 69.Thought maybe i read the D 7 7 wrong but i dont see a EG or anything ending in EG 69 or newer in case it was actually D 7 1 ,,any thoughts,im lost or blind?