COMBO QUESTION!? SHOULD I CHANGE!

Wow, are you really dropping that much money at one time or do you already have some of this.

The injectors are WAY too small, they will max out on a blown motor below 400rwhp, and that combo depending on PSI is going to be closer to 600rwhp. I think you are trying to shoot for the sky, or just dreaming. The stock block will not put up with that much power for too long, and with that HCI combo on a little 306 your going to have to spin to 8000rpm.

I might lose some compression and get domed pistons for a blown motor. Not sure if you can use domed pistons with AFR's? I remember hearing something about that.

3 inch pipes all the way back. I'd consider a sportsman block or Dart but there pricey and worth it so you dont have to worry about your block splitting in two. The T5 isnt gonna hold to much abuse.

Well kick ass then. I think it should be making more power. My friend is at 405rwhp and he has a gt40p, track heat, TFst 1, and 10# pulley only showing 9lbs.

You have much better parts, I think you should be making better power

So are you saying that your new combo made less horsepower than the old one? I think you made some things too big. A ported cobra intake on your combo will be restrictive up top( they are good for 400-450 hp), especially with more boost, but yes it should add a little down low. Water injection will add plenty of power the more boost you have (tune it on the methanol inj instead of race gas at the dyno). After 500 hp or so you will need bigger injectors. Your efi spyder intake is probably too big for the combo you have listed, but if you are going turbo soon just keep it, don't waste money on a cobra intake even a ported one: a trick flow or holley systemax 2, or edelbrock perfomer rpm 2 intake would be much better untill you add the turbo and lots of boost. You should have enough spark once you add the msd setup you described, that should solve that prob. My advice would be to stick with one combo and keep working with it untill you have it maxed out, you definately should be making more power. Why are you adding a turbo, just get the combo sorted out and you will gain as much or more power than if you bolted on a turbo to you current power numbers. If you are definately building a turbo motor, you should be buying things for that set up which will be different than what you have already. Just my opinions, hope it helps. Peace