I have had a couple of engine cases open for a while and the bolts got mixed. I went to Partzilla and printed out the case diagrams for top and bottom, then I hand wrote in the bolt sizes so I don't accidentally short thread something.
It seems obvious but now I won't be wondering.
It gives me a way to check the length of the crankshaft studs also, they are used and mixed with top end stuff so I can be confident with them also.