73 Duster going from manual to automatic

This is hard to figure out 400 HP and making it an automatic so the "KIDS" can drive I can possibly understand the wife but ?

I also have accres to a mildly built 318 that would be more suitable for the teens. Easy to switch motors around after the initial swap has been done.
I have a 1972 318 has new rings and rod and main bearings in it also has a new Howard’s Performance hyd Cam and Lifters. Has new valve job on “302” closed chamber heads