Hello all. I'm about to purchase a 73 dart with a 340 but am concerned with this knocking/ticking sound. The seller seems to think its the cam that is ticking and nothing to worry about. I'm no mechanic and this is the only video I got with the sound. Best way I would describe it is its similar to shaking a spray can. It can be heard in the first few seconds here before I go to the exhaust. Any thoughts?