Lots of factors add up to the required front/rear pressure bias - master cylinder bore areas (if different between front and rear), brake caliper/cylinder bore areas, pad area and coefficient of friction, vehicle weight bias, front and rear tire sizes, and driving style. I suspect, however, that with drum brakes out back, a prop valve of some sort would be a very wise idea - drums typically operate at lower pressures than discs.
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Eric Bryant
1996 Impala SS - 396 LT4, T56 (RPO M10 SSR unit adapted for LT1 use), plenty of other goodies
My mod list
2012 Camaro ZL1
2010 Ford Flex EcoBoost
2008 Ford F-250
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