Spun 360 Rod Bearing

You didn’t lose a bearing because the bearing failed.

You need to measure the housing bore of the rod and see where it’s at.

Measure measure measure.
A measuring we will go.
Just had one come here from south Jersey. Make sure the shop you take it to thoroughly cleans the block and crank. He does recondition rods also. You can have it neutral balanced so any damper or torque converter can be used. We have dampers and can cut the weights off the converter. A good balance engine spins like an electric motor . The better the balance the les wear it has. We have 340 blocks cranks and rods. here also
I'll be doing the cleaning. That's one aspect I'm familiar with. I'm hoping the crank I have now can be saved. Looks worse in the picture than it is, I think.

What was the bearing clearance when you stuck bearings in it early on?
.002"

I'll get back when I have more info.
Thanks everyone for getting me going in the right direction.