sparkplug diagnosis help

[Stang_ROTY]

Chris,

I got an update for you. Today I started thinking about the fuel pressure. When I got home I started her up cold (she stumbled, stalled, etc.). So I got her going again and I pulled the vac hose off and quickly set the fuel pressure to 39 psi (which is what the chip people recommended) before she died. As I was dropping the fuel pressure the stumbling, erratic idle, etc. went away and she started idling much better. So I then put the vac hose on and the fp went down to like 33 psi. I then shut her down and she started right up again which is progress. This leads into my question.

When setting the fuel pressure, do you set (for WOT) with vac hose off or (idle) with vac hose on?

Correct me if I'm wrong....the reason for pulling the vac hose off is because at WOT vac is zero, so essentially I'm simulating WOT by removing the vac hose. So if you set fp for WOT, than I've been pig rich this entire time, flooding her real bad. No wonder she loads up on me at the stoplights.

But 33 psi at idle?? Does this sound right for a 393 w/ 30 lb injectors, 70mm TB, and a 75mm MAF?

Or do I set the fp to 39 psi with the vac hose on?? If so, the fp will rise to about 45 at WOT.

If the answer is that I've been rich this entire time what damage, if any have I done?