Bolt thread and length question 360 magnum

I have an 87 360 magnum and a 904 trans. Neither had the bolts to put the two together. I can't seem to find any information (poor google fu on the subject i guess) as to how long or what thread pattern to use. Could anyone point me in the right direction?

I don't have a bucket of bolts sadly. Next stop is the hardware store to stock up as I'm going to need them to put the 71 Dart I bought back together. Lots of parts in the car, and nothing to put them back on with :|