4bbl running rich.

Is it a Holley?
I have ran many edelbrocks with stock pumps so 5-7 psi shoudnt be a problem. If it were too much fuel pressure it wouldnt idle. If I read your post right you said it would idle fine.
Yes. Mike. It idles nice and starts easy. Took it around the block to see if it shifted ok and (4 spd) goosed it. Went sideways immediately. So it's getting fuel but don't know about top end. Never let it out yet. 416 w lots of tweaks like headers, cam, NEW everything. Moroso spark.