this may be way off base, but did you try an adjustable PVC valve on your engine ? [i think m.e. wagner makes those] i bought two of them for my project engines [one for my charger's 440, the other for my "humpback" delivery that will have a ??? stroker engine], but i am nowhere near ready to try these to see what they may, or may not, do according to wagner's description on their web site.
