So I think I've got it. After much contorting and hyper-extending my knees I found what I think is the block casting number up by the back of the block, on the passenger side. At first I thought it read 800887, when I put in Y4 for the engine code here: http://www.wallaceracing.com/enginesearch4.htm I found a corresponding block code of 500557 for a '77 with a Y4 engine code.
I guess it must be 500557, which would make sense since my car is supposed to have the 400 in it, but damn, that number is a pain to read...
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