Your over thinking this and worried and I get it. I understand. Been there myself. NO worries.
Sleeves will come in all sorts of lengths & thickness. Your machinist will look up what is available and bore the engine out as far as practical to accept the sleeve.
Once it is done, it will hold a lot more power than a big overbore and last a long time.
I’m also thinking what rods to buy for this. Don’t want to use old 440 source ones that ran in this engine for many years already. Thinking about Molnar billet rods but it’s a matter for another topic.
