have no idea where are you located... if you were in italy id know who to send you
not everything is written on the internet... the way my friend did it was to first renew the journal area with a spherical endmill (see pics|), then see how much to remove from mating surface to achieve right clearance and do it with a surfacing mill.
another way is to first lower the mating surface (on a mill, not DIY/sanding) and then bore line the journal.
both ways will not be cheap, so cant assure this will be cost effective.
talk with a serious machine shop that works on engines.
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