I have done several 1000+ HP using throttle body injection ... but (there's always a but) this only works on systems that do NOT have a minimum vacuum requirement and are tuneable with a laptop. The hands-off totally self-tuning systems cannot learn at idle on high HP engines. Also most TBI systems do not have large enough injectors. FAST offers a TBI throttle body with (8) injectors that will support 1000 HP. It has (8) 74 lb/hr injectors. That throttle body paired with their Sportsman XFI ECU can do the job. Although it is self-learning you must tune the idle, cold start, and accelerator enrichment fuel.

Although this works I always ask myself why not just go the final step to port injection. I'd rather not have a wet manifold for cold start driveability.

Systems like this that I have tuned run great, are easy to drive, and are tunable from inside the car, but you will not gain HP.