I also plan on swapping the Master Cylinder from a 2004 Chevrolet Tahoe that I pulled from the junkyard last year.
I would do some serious research first and make sure you really want to do that. There has been quite a bit of discussion on the NBS master cylinder "upgrade" here, and the general consensus seems to be that while it will improve pedal feel/travel, you could actually be reducing stopping power in a panic stop situation. I would stick to the factory sized MC personally.
If pedal feel is an issue, bleed the ABS module with a Tech 2 or comparable bi-directional scan tool. This combined with braided lines and good pads/shoes has given me excellent results in both of my '97s (Both in pedal feel and stopping power, JB5 and JB6 brake systems respectively).