A couple of points i'd like to share. First of all, if i remember correctly, you run 7 inch wide wheels, right? Be prepared for wheel spacers mate. You won't know for sure until you've measured them, but mine don't look wider than yours (quite the opposite) and still needed 6mm wheel spacers. If you do need spacers, don't give in to the usual cr@p that you need at least 12mm thick spacers.
Also, don't get your hopes up all that much. Braking force will be dramatically improved, but feeling will be the same horrid sponge-like mess. Also, since your calipers have bigger pistons than mine, i guess you will have a bit more pedal travel, if i'm not mistaken.
What i'm trying to say is that by themselves, the big brakes didn't work on my car as i would like them to, so i got hold of the ATE black servo everyone over here is talking so much about, and i'm trying to get a pump to fit. Having said that, if i match up the servo and the pump, the only thing that has been left as it was from the factory on my braking system would be the pipes.
Wait, that's not entirely true either, i did change them as well to fit the ABS
Oh, almost forgot, i run Brembo monoblock aluminum calipers with brembo gold series 284mm discs from a 500SS (same as 155 V6, coupe 16v turbo etc).