honeing issues

Generally speaking, if it has a ridge there and you got the pistons out, don't worry with the ridge, the piston rings came by, so there shouldn't be an issue when re-assembled and fired.
All that being said, if the ridges have any sharpness to them, or the pistons came out unwillingly, with some force, the block should be bored.
A ridge reamer needs to be cautiously used. Have a competent machinist SHOW you how it's used.
It boils down to taking out ONLY THE HIGHEST POINT (lowest blade depth) of the ridge, not ALL of the ridge.
The best tip: All cylinders wear oval, find the high spot and cut 'til the piston rings slide by. All it needs is a place to start by, no more.

NEVER knowingly run an engine with a sharp ridge, as this is a hot spot that'll lead to pre-ignition (detonation). This is why extremely high mileage engines will tend to detonate more than lower miles ones will.
Add to that the fact that high miles engines will tend to burn a little oil and you have the workings of a gas-fired diesel.

Mark.