new engine or stroker kit?

I cannot really tell by the pictures but it looks like the top coat is off the bearing and down to the copper

Crank doesn't look grooved, have you checked it with a micrometer

could it be turned or polished ?

how many miles are on the bearings?

unless there is a serious groove in the crank it probably is serviceable

if I were to start over again I think I would just buy a Blueprint engines stroker motor

30 month 50,000 mile warranty on a 408 stroker for $3,600 + shipping