Probably yes, as long as it wasn't originally a cast crank 383. If the 383 engine was originally a 1971 2bbl it will have a cast crankshaft and be externally balanced. Just make sure isn't two balance weights welded to the torque converter and then go ahead and get the B&M flexplate for the cast crank 440. If there are two balance weights on the 383 torque converter you can remove them and get the B&M flexplate. Supposedly there is a difference in the cast crank 383/400 torque converter balance and the 440 cast crank balance.
