Quote Originally Posted by pat mccarthy View Post
the dampers are the same so the front of the crank is internal but on the one pc seal cranks have to be external in the back of crank from lack of weight thats needs to be on the flywheel older350 two pc crank engines were internal
Thank you for the info.

I have looked at the flex plate and found no weights on it. So just to be safe I am going to have the whole rotating assy balanced to be sure it right.