1972 Duster Project

Ok folks. 440 sold. I have two 360s at the machine shop. 512 for Swinger is underway. I can choose from 360, 400, 383 for this car...will likely sell this car or trade for B body....what would someone want? Issue I have with BB is that this car is sitting on all lightweight brakes and suspension. Cost associated with upgrades will be in upgrading those areas vs sticking with SB or slant power plant