I agree with Walt, if you need to ream the ridge it's time for a bore job. The ridge is the part of the cylinder that is still original, it's the rest of the cylinder that's wore. 0.020 on each side is a lot. You may break the pistons trying to get them out when the rings hang up on the ridge. If the cylinder is wore that much at the top it's most likely wore bell shaped, which means more in the middle or bottom and the rings can't expand and contract that fast in each stroke to compensate and seal. So if you only remove the ridge your engine will most likely still burn oil and smoke. The wear can also be caused by over-heating, I would remove the block and get it boiled out it may be full of debris or rust.
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