I think there's more out of balance than the motor. But that's OK happens to the best of us. Hope you work it out for the benefit of the motor.

Is the title of your thread, which means to me that you want to take an existing plate and have it balanced to match another plate.

Well, given that "Aaron Kaufman, Tony Z and Andre down here in San Antonio have reached out to help so I think between the 4 of us we can come up with a solution.", I will be extremely interested in what "solution" they come up with that hasn't already been mentioned in this thread.  There are only so many ways to skin this cat and I think all of them have been covered.  But what do I know.  Been doing this for over 50 years and am only a cockroach. 

But I have a prediction, when the solution is found, and it is one that has already been covered in this thread, the OP will never post it.  He won't be able to admit that some of us were right all along.

Deans69 wrote: For those who actually have knowledge to pass on and offered advice I appreciate it. For the rest, thanks for reminding me how this hobby attracts a lot of cockroaches. Aaron Kaufman, Tony Z and Andre down here in San Antonio have reached out to help so I think between the 4 of us we can come up with a solution. Funny, they all said the same thing, stay off the forums, lol.

Just don't underestimate the impact of the flywheel or flexplate being even a tick off balance.  The original flexplate on my 290 got a crack in the ring gear.  Just the tiny space from the crack threw the balance off enough that a vibration would start just under 40mph and increase to a hard shake by the time it got to 55mph.  There was no other indication of the crack, zero symptoms or issues starting, shifting, driving.  The flex was replaced with a proper used one and the issue disappeared immediately...without doing any balancing on it.