Do not get an Fitech.. they are still having quite the problems and I still get them coming across my dyno quite often the majority do not work properly. Most is to do with transient fueling issues.

The Holley is a better system and has a lot more engineering hours put in as they seem to work better out of the box.

A GSL-392 walbro 255 inline supports 500~RWHP and an 044 bosch is around 650-700 RWHP. Never hurts to carry a spare!!