Small block starter and flexplate issue

W
I

Internal balance or does it have weights welded onto the flex plate?
I had a shop weld weight to the stock flex plate of a 360 to balance it....bolted it up to the 727, starter in....turn left, chunk...
Looked and found the flex plate weight hitting the locating portion of the starter body that protrudes into the bellhousing.
Check that too.
Would like to send you the video or on the forum. As far as I can see it is normal. But would like to confirm our thoughts.
When the engine starts, does the motion of the flexplate push the starter back to normal position?