Well I did a head gasket change reset the timing and while rotating the crank intake side went a tooth off I reset the cam forced it down slowly because it didn't sit flush after the time came out and rotated the crank went a quarter turn and heard a ping what could that be

 

So to recap, (correct me if I'm wrong)
-you set timing at TDC, then tensioned the belt
-rotated the crank to prime before starting
-found the intake cam to be a tooth off
-what do you mean by forced it down slowly cuz it didn't sit flush?

 

It doesn't sound good, I would take everything off and start again! ping noise can't be good