I want to get more horsepower from my truck and make the idle

>>17128356
Headers
Heads
Intake
Cam
Carburetor

This is standard stuff. Do all at once and have it professionally tuned. There's guides everywhere on what goes with what.

Cam it and be a slave to premium gasoline, new heads, new exhaust, new ECU (if that's even applicable), electric fan, electric fuel and water pumps, carburetor.

400 from a 350 is stupid easy and pretty much the low end standard in drag racing. there are probably 10 really good articles that give you full specs of how to make 400 at the wheels with a 350

Basically you have low flow-rate heads which provide great torque but can't make power and a super wimpy camshaft. Look into those two, figure out fueling/ignition before starting mods, and build around that.

Lots of magazines,articles, and ppl related to Chevy v8s who can give alot more depth then you'll usually find on /o/ desu, look around the net a bit.

>>17128415
So new heads and a cam is the ticket? Also I'm googling shit right now.

>>17128366
>all those mods for a tbi vortec
no famalam. cam, valvesprings, lower friction valvetrain, headers and an intake. more agressive mapping will be required.

>>17128440
You are basically gonna have to redo the entire top end of the engine

not sure how much power those TBI systems are good for but probably not a lot

>>17128356

http://www.hotrod.com/articles/ccrp-1004-1989-chevy-k2500-tbi-setup/ example of a cheap start.

But headers and a head swap are a must for 400hp. No comments on long term durability though.

Wet nitrous until it blows, then swap a 5.3

>>17128605

Another example

http://www.hotrod.com/articles/0611em-vortec-small-block/

>>17128450
>>17128648
It is not a vortec niggars.