No your thinking is right on track. For drag racing you have the set up. The newer models have and intercooler. great for temp control but useless in a drag race. when you get to the high egts, then you go with the methanal and water spray(windshield water) that will keep it cool go down the track.....and give it a little bit more Kick.
Carry on, it looks great.
I had heaver exh spring because i had an exh brake. never changed out my intake spring because of boost. You have a little bit more efficient turbo on there then i did.