Say I have a mitutoyo dial bore gauge and I want to measure bores for journal oil clearance, taper, roundness etc, what is the preferred method to calibrate the gauge with?

I have looked over the internet and there seems to be three main options, master ring gauges, block gauges and using an external micrometer/caliper. Given the accuracy isn't quite that of what is used in aviation, what would be the most realistic and accurate option for the cost in calibrating as I don't quite have the money to spend on many master ring gauges. I also don't understand how a block gauge calibrates an anvil, as I have looked everywhere and people say they calibrate with a block gauge and it doesn't make sense as to how they calibrate it, yet the micrometer/caliper method and the master ring gauge makes sense.

Please enlighten me as to the best method to accurately calibrate bores and cylinders in cars with the dial bore micrometer.