The drivers side gill vent location on the frame works great. It's basically hidden but still easily accessible. On that side I also put my firebird actuators for the Killer Lights and on the passenger side the MSD Dgital 6 box. 3 fasteners per gill and you have easy access to everything.
This is a great upgrade. Pedal pressure is always constant and very firm.
To get the location that I wanted an L bracket was welded to the frame and two holes in the plate drilled & tapped to mount it. Frame & bracket got a final coat of ChassyKote for protection before final mounting of the ABS unit. Two additional photos for reference: