If you're looking for 400rwhp, the 435's will get you there easier, but it is also easy to hit 400rwhp with 370's as well.
Either injector will run very hot with a stock turbo, AND pump tuning, but if you back off the fuel screw, you won't have any EGT problems.
For 400rwhp, I also suggest a fuel supply upgrade. If you still have the stock lift pump, get rid of it and get at least a piston lift pump. upgrading to 1/2" lines would be a nice upgrade as well.
What is the price on the Coaltrains? Can they do custom work as well? I would personally see how much a set of their 6X.016's would cost, as you would never grow out of them, unless you went to twins. :thumbsup: