What to do...

A dual plane would be a step backwards with a 4500 stall and that cam. If this were my car I would put more converter in it, a good set of rear adjustable shocks, and start thinking about a trans brake. Get it to leave on the converter and hook and it will ET better. Where is peak torque? Have you had it on a dyno?
I figured it was a step backwards.. no dyno.. converter is planned.. mainly because I want one that will handle nitrous. But I will say it feels like it will pull Past 7000rpm.. I just ran out of time to up the rpm in increments. Plus 7k + makes me nervous lol