Fuel hose AN6 or AN8

Did you install a check valve on the output of each pump?

No. I have the same set up on another guy's car - twin feeds, filters and 2 Holley Blue pumps feeding a -10 to the front. I keep telling him to take those pumps off and put something decent on, but he says they're fine. Big Block Chubby, 9.40s in a 3300# car.