Some were machined incorrectly which results in some alignment problems. Mine is one of them but I was able to get it on relatively easily. Mine resulted with a gap at the pan rail on the fuel pump side which I just filled with silicon and allowed to set up before installing the pan and gasket.
RE the bolts, I can double check tonight if no one else has an answer, but 3 x 3/8 and 1 x 5/16 seems right.
Lawrenceville, GA