Swapping a 360 from A-Body/auto into a '78 Dodge Van with factory 318/4 speed - Advice?

Good, 'cuz that old 318 is a DOG!
Good one
I recently tuned a 360 in a 77 Sportsman. With a 727,3.23s and very tall tires. I must say it was a different animal after I got thru with it.
Your 4 speed will absolutely be more fun; For you,lol.