Uses 153 T flywheel----only problem with this adapter to SBC is the clutch slave can not mount similar to original---no room at the rear of the block---I have built a bellcrank system that mounts the cylinder on top of the trans---this transfers the push cylinder motion to a pull setup to the clutch throwout fork.
Your car/installation really looks nice---like the headers----what type mufflers did you use???Space is really tight.
Leroy 2126