Hi all i have a 302 in my 69 falcon(not stock as stock it was a 6cyl car) i got under the engine next to the starter and came across these numbers

either
d1zm-6015-aa
2of2

or

c1zm-6015-aa
2of2

i cant quite tell the first letter but am pretty sure its a C


can anyone tell me what block this is? im sure its been built as its got some decent power(more than my old efi 5.0 mustang) and its got chrome oilpan and valve covers(i cant see the guy i purchased it from puting the chrome oil pan on if he didnt remove the engine and have it built, if you know what i mean)