Fuel pressure was right on 40psi with the vac. line disconnected, and 30-31psi with it on. The vac line came off very easily and seemed a little brittle, so I used a small zip tie as a hose clamp when I put it back on. I think I'll replace that line this weekend. The inside of the vac line was dry so I believe the regulator is okay.

I let the car run for about 30 minutes in drive with the wheels blocked and the AC running. It did not stall nor did the fuel pressure fluctuate. I Changed the fuel filter anyhow as a pre-emptive measure. Thanks for the advice Tone and btw, I got the popper kit in the mail yesterday, looks great.