Has a parts breakdown. Make sure you have the Clutch Release Fork (B8), the Fork Pivot Bolt (B9), the T-shaped Fork Pivot-nut (B10; this clips into the clutch fork and is shaped like an uppercase T); and the Slave Cylinder Adapter Bracket (B13). All these parts carry a 13-86 Tremec part number. The T-nut is discontinued; but we drew up a design for "Hawk's Third Generation" in Easley, SC. They are the only ones carrying this part. They also usually stock the Bracket and the Clutch Fork.
Probably the best first hand knowledge on the conversion is going to come from the NastyZ28 guys. An overhaul kit for this trans is a little over $500. This doesn't include any gears. Reverse on the mainshaft is usually replaced during a rebuild and thats probably another $200. If it's never been opened, you'll want the 3-4th gear iron shift fork (factory replacement for aluminum shift fork Tremec PN TNEC0843 around $60).
Make sure you get the 'Tag Number' so you can identify the assembly in case you need parts. Listed at the top part of the first page of PDF; Remote Slave Cylinder; 1386-009 or 016. The -017 or -020 assemblies (under Concentric Slave have the slave cylinder inside the transmission and are originally from LS1 applications which will be more involved to install, so do your homework before you buy.