i am building a 400c.i. engine. i plan on about 9.5:1 compression but i am wondering how much horsepower can i build the engine for and still run a tuneport setup this will be my first fuel injected engine so im kinda just feelin around here also besides the ECM and a few various fuel system/ignition system sensors do i need anything else to get the tuneport to function properly?

 

You might have better luck getting a good answer in the 3rdGen engine forum. Either that, or ThirdGen.org....