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Any input on the valve? I really doubt my dad changed that as I think all he did is get rid of the booster.



Many threads on here discuss the factory prop valves. Most agree that, unless you're doing some concourse resto - which you're not - it's probably better to put in an adjustable proportioning valve, as the factory ones were kind of a one-size-fits-all deal, even though the different body styles were all over the map, as far as weights and front/rear weight distributions. Plus, wet vs. dry pavement changes the dynamics a bit, too. Having the rears lock up first is definitely not good...