Mike , I know you are frustrated because I'm frustrated just reading and reliving my own experiences.
That cam is wrong, but until you fix/change the heads NO cam will give you what you want. I don't even care if you're chasing a dyno number. That engine as it is will SUCK if you don't treat it like a 340 (5000 stall/4.56 gear type stuff) You need to send your heads to a PRO like Vic Bloomer or Brett Miller and then you can stick almost ANY cam in and watch those dyno numbers grow AND the car will respond in kind. J.Rob