Might be a dumb question, timing chains.

[Red Tractors]

Picked up a 350 to put in old Blue, supposedly out of a '73 Chevelle/Nova or Camaro. 3970010 block, (two bolt) 333882 heads. Typical craigslist engine buy I suppose. We've been cleaning it up, getting ready to paint it and put the intake I got with the truck on it. Going back to as close to stock as I can, Q-jet and all.

I'd like to pull the harmonic balancer and change the timing set. It's just an old farm truck so I don't feel a real need for anything exotic. O'reilly's lists two different timing sets Cloyes' C3001K for "Light duty" or C3023K for "HD" engines. for the '71. Other than the obvious, does anyone know if they are 100% interchangeable? The center hole, is a larger diameter on the C3023K, but the bolt holes seem to be the same. Are there some cams with a larger end diameter?

They also list C3023SP and C3023X as options in the '73 cars alongside the C3001K. I have not changed a timing set in a long time, but I have always lived under the belief that all 350 timing sets were interchangeable.

Any help or advise would be greatly appreciated.