vacumn ?

First off, I do agree with Del that a single plane aint the best in the world for your combo, BUT, if I was gonna run one, that would be it. They give up a lot less down low than most other single planes. Your problem though aint the intake, so lets forget about that.

You got the Mopar Performance Gold box? Did I read that right? That right there could be your problem. The gold box is WAY too hot for a street car. It's probably burning itself up. They are NOT made for prolonged running. They are that hot. They are made for, you know, 1320 feet at the time and then shut off. First thing I would do would be put a Standard Ignition LX101 on it. Not a Wells or any other autozone bullshit, but STANDARD.