340 Engine Shake

Pics of the crank journal. Rod bearings look just like the main bearings.

View attachment 1715981941

View attachment 1715981942

For a street engine I would polish the crank and run it.

If the block cylinder walls don't show any signs of blueing from heat or a thin spot, I would at least have it checked out at a machine shop.

Even if it has to go bigger than .060 over, as long as the block is sonic tested and checks out there are pistons available for it made for the large bore R block engines.