I'm running the Holley Blue and big lines (look in my sig) to and through the stock LP. No problems 26 idle 20 wot.
My stock LP went out and my FP dropped to 15 idle, i replaced it and back to 26 again.

 

Scottsjeep

Did you just splice into the fuel feed line and run the big line to the stock pump? Is the stock pump still working or did you unplug the electrical connection?

thanks

 

I'm running the big line (1/2") from the tank-Holley-LP-FF-VP44. I found just running the Holley by itself only got me about 15idle and i like 26 better.
the stock LP is still running, i power the Holley with a relay triggered off the LP harness.