Best way to get to ~400hp, 454 tbi. Anyone build one?

[cochino12]

Id like to get some more power out of my dually and I'm not exactly sure what route to take. Of course I dont want to spend a ton money and I do would like to keep it as reliable as possible. I might be selling my 2wd K5 to help fund upgrades but dont want to spend it all on the motor.

Been doing some reading on tbichips.com and it sounds like its pretty expensive to do the fuel pump, throttle body, heads, chip, cam... Seems like it would be a whole lot cheaper to ditch the tbi and slap a cam, intake and some mild head work to get where I need to be. Anyone have experience with the 454tbi? Yes, I realize the truck has peanut port heads but it doesnt seem like the 400hp mark should be to hard to achieve, even with these boat anchor heads