If you're changing your brakes, why not change to something decent? Stock MX83 brakes are pissweak!
I'm doing a brake upgrade on my Supra using MX83 struts, BA Falcon rotors and R33 Skyline 4-piston alloy calipers. It all bolts right up and it will be a massive improvement over stock MX83 brakes.
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Are you upgrading the rears as well or just the fronts?
If so what is the plan for the rears?
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He is leaving his stock at the moment (they are pretty good with vented discs athat are about 260mm dia.
I just upgraded the rears on mine to W140 Merc rears (300mm dia x 22mm thic vented) to go with the upgraded fronts - Scubie WRX STi 326mm dia x 30mm thick.