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Are your plates black with yellow letters/numbers? California plates ran in series in those days.When a combination of letters/numbers ran out they started another series. 1968 could have been the last time a new series started.
I don't think Ford built a factory f250 stakebed, if you check the fordification website they have the 1970 sales brochure which clearly shows only the f350 available as a factory stakebed.
Your vin doesn't show the color or trim level although that info is on the warranty plate.