Is your engine building more than 800 HP or does it require fuel pressures in excess of 65 PSI?  While the rest of the Holley EFI fuel pressure regulators are good up to this point, going beyond this you're going to need to consider something more extreme.  And the VR-Series fuel pressure regulators are that extreme you seek.

These pumps can handle the fuel flow produced by Holley's VR1 Ultra HP Fuel Pump and VR2 Ultra Dominator Fuel Pump.  Available in a 2-port version (PN 12-851) with twin -10 AN O-Ring Boss (ORB) inlet/outlets and single return or 4-port version (PN 12-864) with quad -8 AN ORB inlet/outlet and -10 AN ORB return. Includes a barbed fitting for vacuum reference as well as a -4 AN male adapter for boosted applications.  Compatible with nearly any fuel you will throw at it, including gasoline, E-85, and methanol.  Adjustable from 40-100 PSI.

Not Sure? Review this product documentation before you buy!

 
Installation Instructions
Holley VR-Series 2-Port Fuel Pressure Regulators (HP and Dominator)

 
Installation Instructions
Holley VR-Series 4-Port Fuel Pressure Regulators (HP and Dominator)