B vs RB

If you are keeping stock stroke, the 440 would be more bang for the buck. Cheaper to rebuild too unless you don't care about decent compression ratio. However, exh is harder to fit, power brakes are out (which for me would never enter into the equasion anyway), and fitting a 440 with any real intake under a stock hood will give up some power. The B wedge fits easier, is about the same weight as a stock small block, and should be easy to find. You could sell the 440 for more than any 383 is worth.