You spent money on a bore gauge, on a budget rebuild?
You have calipers, you can cut a coat hanger to a little longer length, grind it to size and check bore taper cheap.
I carry a couple of cut to length coat hangers with me when searching for standard bore blocks at swap meats.
That is a good idea I bought these they where 12 bucks not exactly gonna break the bank. And I'm sure I can use them for other projects. One off the top of my head is valve guide clearance!