Turn a small drill press into a Bore/ Hone. Bolt it to the top of your engine block & do your own machining .

Jessearent said

Maybe the local thrift shop has that outside micrometer? Maybe an inside one also.

Click to expand...

Years ago I picked up several micrometers and calipers at a yard sale. The husband had retired from being a machinist at Caterpillar and he was selling off all his tools. I spent a couple hundred bucks and probably got at least 3 or $4,000 worth of instruments. So they are where you find them.
I also pick up a lot of Snap-on and Craftsman tools at yard sales. A lot of people don't realize they have a lifetime warranty so you can trade them in for new ones if they're damaged.