Aha! I found it. Thanks to Paul Woods for doing all the grunt work in testing all this out. It's a great setup, and if I can ever find the parts I'll be doing it with a few changes.
The Short Version:
Fronts:
Get calipers and rotors from ST205 Celica GT-4 (Aluminum 4 Pot). Remove old crappy MK1 brakes and brake shields. Drill out mounting holes in calipers to 14mm. Run an M14 tap through the caliper mounting holes on the MK1 hubs. Put 2mm washers over the bolts between the caliper and the hub and bolt on. The next part requires a machinist. Take the ST205 rotors and turn them down to 300mm. Drill the 4x100 (pcd 100) bolt holes into the rotor - one of the holes is already in the correct place, and the other 3 are drilled in the spaces between existing holes. Bore the center hole out 3mm, then get a 4mm spacer ring to fit in the middle (The MK1 rotor is only 1mm smaller center diameter, and they don't make 1mm spacers). Bolt them on, and either detach the stock hose from the strut or get ST205 hoses, and you're done... with the fronts!
You'll also need 16" or bigger wheels to fit. I run 16" and I like them, but I imagine you can get better track wheels in 15" that should clear them.
Rears:
Get yourself some Revision 2 (93+) MK2 rear calipers, and the front rotors from a 1989 VW Corrado G60. The rears are a little more tricky. The calipers need to be mounted further out from the hub. To do this, cut the mounting tabs off of the MK1 calipers, and cut notches (where the bolt holes are) on the MK2 caliper. Tack weld the tabs in with the bolt holes exactly 131mm apart, and test fit it. You'll have to mess with the spacing some to get the pads and caliper exactly centered, then weld the MK1 tabs in. Plumb it all in, and re-connect the stock e-brake cables, and you're golden!
Since I only want the credit for sharing this
here is a link to the original page:
http://www.mr2mk1club.com/Bigbrakes.html