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I just got my car going and I'm wondering if I have a faulty Aeromotive 13129 fpr or if a single walbro 450 pump is more than it can handle. Idle pressure is 72 psi and doesn't change with the adjustment screw. The fpr is rated to 1000hp and pump is 750hp+. 450lph > -8 feed > -8 fuel rails > fpr > -6 return
I would suggest running the return into a gas can to see if your return line is causing a restriction and increasing the pressure. Pretty easy test that I did with my stock regulator and confirmed it was too small.
I almost picked up the same regulator to use with my 450, but got a Fuelab mini regulator. Hope to install it this weekend.
Since the regulator is a dead-head system, 100% of the fuel feeding the injectors has to pass through it first. So if the regulator was going to get overpowered, it would be in my setup, not yours.
I recently turned the base pressure up to ~70 PSI and unhooked the boost reference line. Seemed pointless to have one. I was running 46 PSI base with 24 PSI of boost, giving me 70 PSI of fuel pressure. Blew the vacuum line off a couple of times. Decided it would just be better to turn the pressure up to where I wanted it and leave it there 100% of the time. Still idles great at 15:1 with 80 lb injectors and 70 PSI of fuel pressure.
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Aeromotive 13129 limits 
