Thats not all that was done to the motor i didnt have.time to list it all. It is a 5.0 with a stage two trick flow cam 1.7 ratio roller rockers and new springs the heads are gt40ps that are ported and polished with chrome molley push rods and the lower intake was ported out and my dad is finishing up a upper intake for it i have 42 pound injectors and i just bought a set of inch and 5/8 headers also i have a 95 mm throttle body. The 500 isnt exact but its about 450- 500 the guy tuning it said i will easily have 550 ft lbs of torque
I have a Mild CompCam *above a street cam, so essentially stage 2*, 1.7 RR's, Double valve springs, GT40P's, intake, and injectors. Push rods don't mean diddly.
Ported heads, headers, and a bigger TB are not going to give you a 150-200hp gain. Intake and TB will make Minimal difference in front of an M90, it can't/won't pull enough air to matter, Ditto on the lower manifold. The M90 does not have that kind of efficiency. At 8PSI My blower is SCREAMING, there is just not much left to give.
I've been told by a professional tuner that with my current mods, with Headers, and with a good tune on E85 MIGHT kiss 400whp, so that means you hope to get 100WHP out of a ported lower manifold and a bigger throttle body.
I'm not trying to be a dick, My truck feels like it has a million horsepower, and when I was young I thought my swapped civic was a rocketship. but real numbers are cold hard reality. Your block will crack in half long before you hit the 500 mark, 450whp is the long acclaimed "wall" for stock 5.0 bottom ends. If your engine guy thinks a stock bottom end can hold 500whp, you should look for someone else. That's not just me talking, that's just common knowledge.
If you want big power, you have to ditch the M90, And go with Heads, a Centrifugal blower or Turbo, and forged pistons/rods. "You have to pay to play" and at 17, I suspect that wouldn't be within budget.
I didn't spot, what transmission do you have behind your current setup? T5's start to explode around 350-375whp mark.
I suspect once your rig is all together you will dyno right around the 300whp mark if you are on 8PSI, which will still make for a fun as hell truck that should easily run comfortably into the 13's all day long.