mine is for a monte carlo, 1985 ish. a little long, but works. edit: specify no cruise control. there are different ends.
When i worked at the parts store, the book had the combination of ends on the back as well as the lengths available. The hard part will be finding a parts guy willing to go through the trouble of looking unfortunately.
Go to a parts house and get one for a 69-70 Chevy PU with 3 speed or auto 2WD. Will work fine. Tell 'em truck has RED wheels!! LOL
Most Chevy speedo cables have the same ends on them from the 1930's on up. If a cable from a '54 is long enough, then use it. Otherwise try the later model truck as suggested.