Have you ever thought about using the master cylinder/self contained system like the GN's use (I don't mean the earlier hydoboost system)? Thats what I run on my Regal race car and as it has its own air pump (doesn't need any vacuum source) so you can run any size camshaft/lift/duration and it will not effect the brakes but will stand the car on its nose if required. My Regal won't run 131 mph but it will run 127 mph and I can stall it to 3200 rpm or so before the torque of the motor over rides the brakes. If you were to go with this system you would also need the plate that this system bolts to as the 4 studs on the back side of the plate will match the 4 stud holes your current system uses to bolt to your firewall. Just another option.
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