Don't forget that with the PG to Mopar Engine, you'll also have to have a special converter made up. Powerglide back side and internals, but with a Chrysler front cover(engine side). Not a big deal to get made by someone competent, but not inexpensive. The shop that I worked for did many of these types of converters for MOPAR, GM, & FORD engines with different brands of transmissions. My ex-employers car runs a 500 cu. in. Steve Schmidt GM motor and it has a 904 behind it.
You'll still need to adapt the block to the transmission, and when you get the converter made you need to tell the converter company how thick the plate is.