I currently finished putting a roller cam 5.0 engine out of a 91 mustang gt into my 1969 mustang. when I drive it a get this really horrible vibration and have a couple ideas why but ive never had the problem so I was hoping somone knew. theory 1: I need to use the harmonic ballencer from the 91 engine instead of the factory one that came of the 69 motor. theory 2 I have the stock 3 speed auto in it and put the old flex plate in due to the bell housing was too small for the newer flex plate out of the 91 which could inturn though off the engine because I know that the flex plates are weighted diffrently. hopefully somone knows what I can do to fix this remedy, thanks Jeff
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