Reply to "Flywheel and clutch"

Those 4-pad clutch discs are for racing and normally chatter substantially on starting out; racers only start once per event so they don't care. The discs are also used mostly with very strong pressure plates- hard to push in for shifting with Pantera pedal leverage, which is very difficult to change. Note- if you change ANYTHING in the clutch area, substantial adjustments to the clutch system will be needed!

Sintered bronze doesn't work well for a pilot bushing since it has no impact resistance and wear will be high due to the void volume in such sintered articles. The recess in the 351-C crank is very large so most of the bushing is wasted material. I use a Chevy bronze pilot bushing with an aluminum ring adapter that press-fits into the crank and press-fits the small GM bushing into it. Its also cheaper and easier to locate than a 351-C unit.

As for throwout bearings, modern assemblies NOT made in China or Mexico are constant-contact types which are designed to run against the pressure plate fingers at all times with no free play, giving a better disengagement feel with the same or better lifespan. Beware of cheap substitutes!