any update? i'm rooting for you, but i have to say that getting 300 horses to the ground with stock ported heads and intake, (even thumper's gt40ps) has been VERY elusive for folks. over the years i have followed many builds similar to yours, and most of them seem to top out in the 280-290 range, and those have an aftermarket intake.
realistically, i'd expect something more in the 260-270 range with your combo.
keep us posted!