Angelo, I would get ahold of an ATRA manual and possibly parts list. ATRA probably has some drawings and specs on the C6 servo. I never needed to upgrade my C6, the C4 in my 1964 Falcon was another story.
For that one I ended up using a front band and servo for a 300 (yes they put them behind those torque monsters). I had started with a Hi-Po 289 setup, and modified the servo cover so the back side of the release area became the apply. When I was able to source a servo and cover for a 300 I used that as it was almost the same as what I built. The C6 has a relay lever, I do not know if there are different ratios for them, I do know that there used to be a case girdle for the C6 to keep the case from spreading under hard shifts. If you can find someone who drag races a C6, they can at least steer you in the right direction.
Good luck with it!
Bill AKA "LOBO"
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"Getting old is inevitable, growing up is optional"
Darth Vader 1986 F350 460 converted to MAF/SEFI, E4OD 12X3 1/2 rear brakes, traction loc 3:55 gear, 160 amp 3G alternator
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