i am running (i think) the same pump, but haven't tried it yet. i have a 3/8" setup to go to the 5/16" tee, and then 5/16"lines to the carbs.

but then i saw a picture of a 572 fresh off of the dyno at tim bannings shop, and it had 5/16" from the pump up. tim had also told me earlier the 5/16" will handle it just fine. i'm assuming the pump is no issue here, although he uses the edelbrock with a regulator tied to the pump.

i'm going to start out with the 5/16" and see from there...