Mopar Fueling Problem

I am having troubles with my engine. I believe that it is a fueling issue but not competly convinced. I have a 1969 Barracuda with a built up 318. I am running a hot solid lift cam, worked 360 heads with proper springs for the cam, full length headers, MSD 6 HVC-L ignition system, Mallory Unilite, Accell 8mm wires, Holley 750 with vac secondarys etc etc. Here is the problem....I was running a Dual Plane LD4B intake on it and wanted to go to a single plane. I purchase an M1 and switched over. The engine was running well prior however I could feel the intakes limits after about 5 grand.

I switched the intake, plugs and wires only! I am still running the same carb, and everything else. The problem is that at about 3500 RPM my engine starts to stumbe and act life its starving for fuel. I thought that maybe my lod pump was not performing at its best so on went a 150lph electric and regulator. I have more than enough fuel to feed it now and it is still doing it.

I switched to a 600 Edelbrock that I used to run on the car and it still does it with the smaller carb at the same RPM.

I can't seem to find any vacum leaks or any other mechanical issues. Timing is good also.

Does anyone have any ideas or have they ran in to this before?

Thanks
Travis
Author: admin