383 2bbl vs 383 4 bbl

i was planning on pulling my 383 4bbl and dropping in a 383 2bbl (im converting to 4 bbl) that is currently sitting in a polara, both motors are out of 69 cars, the 4bbl was stamped H in the vin in the newport with the HP manifolds, all i know about the 2 bbl is that it runs, doesent smoke knock and has good oil press, and the exhaust manifolds are a different shape, what i dont know is what really makes the two motors different besides the 2 bbl or 4 bbl?? ive heard the 4 bbl has higer compression and other stuff from other ppl and others im getting different oppinions, i would like to clear things up before swapping them, and decide to tweak one or the other so to say,

and has any one tried turbo's on a 383???
thanks