i believe everything can be swapped over. i went from a 327 to a 381 and reused my 327 stuff to save money. i had a semi-new long water pump on the 327 though. with a new motor and plans for a new water pump, i would opt to put a new water pump on now, but i know things add up fast.
i also switched from the old school points to a summit HEI distributor, has a 48K volt coil. i love it, very good upgrade in my opinion, i saw better performance and gas mileage. it is a tight fit to the firewall. theres a lot of ignition options out there to choose from.
let us know how your 383 runs, the combo looks stout! you'll definitely be wanting a posi in there, especially with that 3.06 first gear!!