I had Jeff at Modern cylinder head cnc port (to M.W. size) the set of B1-BS I had last year. They flowed 280 at .600 before porting with the standard 440 port size and flowed 350 at .700 after porting. I put them on a 470 C.I. 440 block with 12.0 to 1 compression, tunnel ram with two Holley 750 D.P. carbs, Crane cams custom ground solid roller that is 274@.050 and ground on a 106 LSA in at 105. that motor made 722 HP at 7000 RPM with 615 ft. lbs torque at 5400 RPM I have had other heads, and still do, that outflow the ported B1-BS but those heads did and do work very well IMHO As far as a single four barrel intake to use I would and do, use the Indy 440-2 intake (or the 400-2 for a low deck motor))with a tapered adapter for the Dominator carbs and add a one inch cloverleaf phenolic spacer under the Dominator carb.