Assuming (you know where assuming usually get's you) you are propped 100% on, you need a good dose of hp to reach your goal. If you want to stay FI then go to a shop like Tyler Crockett's where they have parts combos and their own EFI programming for those combo's.
For a cheaper way, you can go carbureted and do the norm's - 750-800 Holley, Air Gap intake, camshaft replacement with appropriate hardware including springs, rocker arms, and etc, and exhaust.
Personally I'd rather stay FI than go carb. I know there are several manufacturers that claim their headers pick up some power on those engines. A cam swap would help, but also require a retune or some way to tune the air/fuel ratio.