Andrew, I'm not sure what your symptoms are but if you're having clutch disengagement issues then Reza is right... it's the South Bend disc / ACT 2600 pressure plate combo that is the problem.

I went through all this myself a month ago. I installed a new ACT Streetlight flywheel, South Bend TZ-Series Kevlar clutch disk, and ACT 2600 pressure plate.

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Once I got everything all back together the clutch would not disengage. I tried flushing the clutch fluid, bleed it extensively, and set the master cylinder adjustment rod, all as per TRE / Jacks Transmission instructions. No dice. With the engine running the transmission would not go into gear.

Upon doing some research, I discovered that this is particular issue is somewhat common when trying to pair a South Bend disk with a ACT pressure plate. It's partially due to the thickness of South Bend disks and partially to ACT design changes. Basically it's hit or miss whether they'll work together.

So I ended up pulling the transmission again, measured the South Bend disk at 8.65mm (0.340") thick and my ACT disk at 8.10mm (0.319")... about a 1/2 mm difference. I also measured the flywheel step and it was within spec at 0.611". Then I put an ACT disk on (in place of the South Bend) and put everything back together.

Disengagement issue solved! No problems thereafter.