Deck height

I've never done this, but to get pretty close I think you would use a 9"-10" OD micrometer with a ball and cup for the anvil that would go against the bearing seat. Take the measurement, subtract the ball diameter then add the radius of the bearing seat. The cost of the tools for this would probably be pretty close to the cost of having a shop take the measurement.

Assuming you are working with a bare block.