383 in a 69 Dart 4-speed

Do you plan on racing your car? You will need an SFI certified bellhousing and flywheel/clutch if you plan on going 11.49 or faster in the 1/4 mile.
I used a Lakewood bellhousing and a centerforce dual friction clutch with a hayes flywheel, works great.

Even if your not planning on racing an aftermarket bellhousing is a good idea.