The bolt pattern on the back of the 392 block is the same as a small block Mopar, so you need a small block trans. The 392 crank extends out away from the block farther then the modern stuff and converter bolts directly to the crankshaft. The adapter kits have a spacer and the stuff needed to connect to the crankshaft. The last I heard, there were a couple of sources for the adapter, Hot Heads (linked above) being one of them. Gene