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How much do you think the seat and valve combined are ground on a wore out set of heads?

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Not "Wore out", Just a valve job like you stated.

Back at you. How much do you think the seat and the valve combined are ground on Just a valve job?

Between the two, if its just a valve job as little as .010 maybe .020 if its surfaces are worn.

Not anywhere close to the .250 x.980 sloped .000 to .250 x 4.08 divot combined surface area of my valve reliefs that equates to 5cc in my KB 237,s

Valve job = touch the seat and the valve. .2cc

Valve reliefs = Big .250 x .980 x 4.08 Slanted gutter. 5cc