Fuel dumping from booster venturi

Hello all, just wondering if anyone has seen this problem. I have a 68 Hemi Barracuda Super Stock car. It has a 572 ci 900+ HP race Hemi with a pair of 800 cfm Edelbrocks. The problem is on the front carburetor from the front right booster only, fuel starts dumping at 2500 rpm. Fuel pressure is at 6 psi, float levels are all good, swapped out the booster, main jet, booster gasket with all new parts and the problem is still there. I would appreciate any input.
Thanks