Carter AVS 4736S--4966S

my 1969 383HP that i just put in my 1967 barracuda, came with a factory Carter 4736S, but i had a 4966S sitting around that i rebuilt for a 440 Satellite i used to own, and I just put it on the 383. car seems to run better, can anyone tell me the difference that i've gained with the carb swap? thanks Gerry