On the fuel pump- Early pumps would blow past 100 psi, later pumps and aftermarket top out at 70-85 psi.
You are having a low boost issue and the fuel pressure is fine, I think you are chasing a red herring at this point and you should focus on other areas.
A pound or two of fuel pressure will make no difference, these cars are not that sensitive to it.
I'd start with the basics- check your cam and distributor timing and go from there.
I would agree a few pounds off on the fuel press does not sound like your problem. Just curious if you could wire the wastegate open and drive the car on just the eng to see how it runs. I did that years back to see how the car ran without any boost and to see if the problem was still there. Ron
