Piston issue
 

https://cimg2.ibsrv.net/gimg/chevrol...dba062a916.jpg
I am currently rebuilding a 350 and after a few different sets of piston rings I finally got the right ones or so I thought. The Pistons fit in the cylinder but doesn't move freely it is very tight and won't move not sure what the reason is I have never had this happen before I am at my wit's end does anyone have any insight

You need to check the ring end gap with a feeler gauge. I don't know what is acceptable, but guessing .02-.03"

Gap is good

Oil it up, and slap it together