Welcome.

It sounds like you have a thought about this for a while. The later truck pcm is a little more flexible but there are plenty of 7747 controlled engines in that power range. Make sure you pick components that provide enough air and fuel to match the desired power level. The swirl port heads are not good for power above about 5500 rpm so you're looking for 350-ish ft/lbs to get 350 hp with them.