After replacing the master cylinder and bleeding the system, took my 74 up for inspection.  It failed.  Seems the front passenger side brake caliper is leaking and will need to be replaced.  It did not leak while bleeding so I assume the new master blew the old seal.   Since my 74 has the Z07 Option (Off Road Suspension and Brake Package) I was wondering if my calipers are going to be different than stock.  Anyone know?  Is it good practice to replace/rebuild in pairs?

The ZO7 option included springs, shocks, stabilizer bar changes, and heavy dooty brakes. The brake calipers(and pads) should have the two retaining pins, instead of the single pin as the standard system.
You can send your calipers out to have them rebuilt/sleeved, or you could simply reseal them yourself, if you do your own wrenching.
It is always best to do all four corners at the same time, if finances allow.

Thanks Adam.  Thats what I needed to know.

be sure to use o-ring seals instead of lip-ring seals as well..

and I definitely concur on doing all four if you havent done any yet and can afford it.

Vett Brakes and Products  has a great kit with O Ring calipers for a reasonable price if you don't find what you are looking for.

http://www.vbandp.com/detail.aspx?ID=278