There is nothing wrong with the basic shape of that, really, although the slight dip in ignition on the 6K line will probaby cost you a couple of lbft, as it should take more timing not less than on 55, but its only a tiny dip anyway.

Personally I will be surprised if it responds well to anymore than 40 degrees of ignition too, so I would imagine your going to need a hotter cam if you want it to pull harder at higher RPM