i don't think there is room for the TTI's with PS.
I have manual steering but also have front skinnys, so it's not to bad.
If the 440 source heads have stock exhaust port loaction they should fit ok. Really I don't think the Shumacher's will be that bad, my friend has them and likes them and he is around 500hp, but likes his PS to much to go to the TTI's.
Sorry, can't help on any thing else.
Have you thought of going to a rack and pinion steering, like the RMS K member?