ViBrAtIoN - HELP

OKmy most recent 340 is a Frankenstein.... parts from all over U heads from here 69 block from there...rod & pistons from wherever..... all went together just peachy...balanced out OK..... got it runnin no problemo.... hits 1500 rpm, worlds most powerful vibrator!! I am thinkin that I may have the incorrect vibration dampner....... any suggestions on how to isolate ??? The 727 behind it has a 2900 TCM converter and a stock flex.....

Johnny 5 NEEDs INPUT