Stock fuel pump will be more than adequate for a dual carb setup on any 216-261 setup. In fact, if you go with Langdon's dual Holley/Weber setup, you'll want to use a pressure regulator and drop it back to 3.5 psi.
I'm running a pair of Carter/Weber 2bbl carbs from Langdon's on a 235+ engine with 261 grind cam and performance and mileage is good. Installation is straightforward and after the initial synchronization, they have held their tune. Have pics in my Webshots of both the dual C/W and single H/W install.
Dave
