I really doubt that you have 25" tires. I've got 26" tires (close to factory size) on my '69 Coronet and they look too small. From your avatar, I would guess that you are running a 27" or a 28" tire.
A 27" diameter tire will give you 2548 RPM, according to the presented math. A 25" with 2.94 gears will give you 2504 RPM with the same math.
What is your actual metric tire size? With tht, I can give you a closer ballpark on the diameter.
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