building a mild Daily driver 318

Okay. thats what i thought. i heard some of the bolt patterns are different on the 904s. some for a slant 6 and some for a SBM V8. From what it looks like i can find a cheap 727. are they decent as well? And if i buy a used one that ran when it was taken out should it be rebuilt before i drop it in?
There's at least 4 patterns of torqueflites- slant, small block, big block, and AMC. Think the Mitsubishi engines have a different pattern too.

May sound irrelevant but the point is with Chrysler automatics you need to source the trans from something almost exactly like what it's going behind.