Totally makes sense on overpressure while lifting when deep in the powerband. Certainly a problem in an autox or OT situation.

The p4529368 pump was in the running for me, but lack of availability and the fit problem were the hangups with that one. The other was the Edelbrock pump, it has a higher flow rating than the QuickFuel, but is probably over-rated.

The Quick Fuel I went with has been tested (FBO) at 104GPH at 4000, and has had the inlet/outlet upsized to 3/8 NPT and had AN fittings installed. That should be plenty for me, and the price was right. Don at FBO also told me no regulator necessary for that one. I'll give it a shot.