aussie 408 combo

the whole engine was designed to see a max rpm of 6000-6500 .
I was looking for more torque than max hp . As with most things I guess theres some conflicting stories as to weather a single plane will produce more power than a dual plane at these revs.I think if it was to see 7000 i might agree but i will be sticking with the dual plane in the initial build at least and see what the engine dyno shows on the break in and keep it in mind anyway.
If the max eddie head lift is .575 with stock springs and the cam is 550 with 1.5 rockers , can any one advise me to how much lift it will be with my 1.6 ratio rockers? bit worried about any binding issues.