Drag car brake/proportioning question

Thanks for all the thoughtful replies guys!

So if I go with a proportioning valve can I eliminate that residual valve or should I run both? Is this type ok? That way it could mount under the car with the MC and the adjustment could be in the cab.

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I put one of those on a hot 406 vega, and one one a 406 sbc GMC , it about did nothing to the rear brakes w/ big tall tires on it --------------??s