Engine/drivetrain vibration?

Here are pics in the link borrowed from another site showing the harmonic balancers. Top pic, right is the harmonic balancer you should have on your 73 cast crank 340.

http://www.moparts.org/Tech/Archive/smallblock/5.html

Here is another pic in the link of the B&M flex plate you will need. Order one for a cast crank 340. There will be no need for weights on the converter with this flex plate.


http://www.moparts.org/Tech/Archive/conv/8.html

Good luck,

Bill