Cloyes, whether the OEM-style normal chain set or one of their roller chain sets (. Either one should last a very long time, with the roller chain being the longest, by observation (as in 500K+ miles in the one I have on one of my cars). OR one of the Mopar Perfo0rmance roller chain sets (on my '70 DH43N). Your cam should be the "Single bolt" set-up, as in one single bolt in the center of the cam/sproket interface. The "3-bolt" version was only on the factory 440 6bbl motors or hi-horsepower aftermarket cams.
Take good care of that Imperial,
CBODY67