Evaluate Timing chain sets
We had a '71 'Cuda 340/auto in the shop a bit over a year ago with 4,500 miles on the inexpensive Cloyes set. The car does not get driven hard or often, but the chain was sloppier than your prom date after a 4-pack of Bartles & Jaymes. One can't expect much from what was, until recently, a $30 timing set. The fella that installed it while freshining the engine has been dead for almost three decades, so it was a USA-made set. Cheap is cheap, regardless of country of origin.