What next???? Mechanic replaced flexplate with BM "scalloped" flexplate and removed the weight from the converter, but no change! Even parked, in Park or Nuetral, has soon as rpm's are brought up to about 2K, it vibrates badly.The hardest thing to figure is it did the exact same thing with the old 318/904 combination.Everything other than accessories are new.I disconnected all the belts and it still shakes at 2K.I really don't know what to do next.Out of money and patience.Right now I have an $8000 boat anchor that I can't drive without getting very annoyed and frustrated.