crankshaft main bearings caps

[poor boy]

how can i tell if i have a small or big journal crankshaft in a 2300 hundred block . the casting number on the block is AF-E3ZE-6015-DA

[car62]

look at the back of the crank,if it is flat all the way to the flywheel surface it is large journal,if the last 1/4" is beveled it is small journal or turbo...but in this case yours is E3(1983)which is large journal,small journal didnt come out until late 1988 or early 1989