Auto to 5spd in 67 289. ?'s on necessary changes.

The flywheel is matched with the year of the engine, not the trans, so you'd use the early flywheel on your 289.

For the clutch you can go different ways. One is to drill the flywheel to accept a late-model diaphragm clutch, or buy an aftermarket flywheel that has holes drilled for both. Another method is to buy a diaphragm clutch with a bolt pattern made for an early flywheel; Centerforce is one of the companies that do this. You could also use the old Long-style clutch if you don't mind killing your left leg from the pedal pressure. I still have a limp that shows up once in a while because of that clutch.

When I swapped to a T10 I used the early factory replacement flywheel and used the Long clutch for a while. Not wanting to buy another flywheel I went with a Centerforce diaphragm clutch. Swapping to a T5 I didn't touch any of my clutch components. I'm sure there are other alternatives, but that's what I did at the time.

I used one of the 50oz 5.0 ones and had my machine shop rebalance it with my rotating assembly they did it for free. It works great with all the modern clutches without any issues.