Bringing back this thread as I finally got the time to disassemble the motor.
Low and behold, cylinder 1's rod is severely bent (maybe others too, hard to know for sure).

Take a look at this thread where I am asking if this looks safe to use the block/pistons. https://www.miataturbo.net/engine-pe...1/#post1606936
I noted a bit of wear where the crank counterweight rubbed a bit on the backside of the piston.
I am unsure if that makes the crank/pistons unusable or that is not a big deal.
I am planning on adding Manley Forged Rods on this block or another block.
https://cimg4.ibsrv.net/gimg/www.mia...f1f01bffd1.jpg
https://cimg3.ibsrv.net/gimg/www.mia...cdb377e2bf.jpg
https://cimg2.ibsrv.net/gimg/www.mia...822234ba64.jpg

I feel like I would be more worried about the oil pump than the scuffed up crank and piston.

Oh the oil pump and many other parts are getting replaced. Good call out though!