I think your heavy B body will like the bigger cubes for sure. I'm also in the process of building a 440 stroker and I went with a 440 source rotating assembly for mine. I have built 4 street/strip strokers with their kits and they have all performed well. My current build is a pump gas 528. (I went with the bigger is better approach). It requires external oiling, but otherwise I figured the extra cubes would only be a plus. I'm going to run a mild hydraulic roller that is 244@.050 and I have a set of Edelbrock RPMs I plan to get ported or perhaps I will step up to some Indy EZ's. Not a race engine at all, but should still haul the mail in my heavy 70 Super Bee.