Which automatic

A 904 out of a 70's SB car would work great and not rob HP like a 727. I raced an 11.0? SB Barracuda for 10 years with a 904. My friend has 3 A body race cars that run in the 10's with 904's. One with a low gear set (2.74 first gear) would make a great street car. A 727 might be good for 4000+ car but not an A body. LOL