A rookie mistake but one you will never make again and as far as a lesson learned this one wasn't an expensive one as they go

A rookie mistake but one you will never make again and as far as a lesson learned this one wasn't an expensive one as they go
it might be a clearance issue like,
the rocker slot binding on the rocker stud momentarily
or the spring binding at full lift,
rocker under side contacting retainer,
retainer touching valve seal,
rocker lock nuts contacting inside of rocker,
have you checked piston to valve clearance!
pushrod rubbing on guide plate or slot, in heads, etc.
you should not hear metallic clicking if theres zero clearance issues,
once valves are properly adjusted
Once you have the valves adjusted, I think getting the ignition sorted will smooth it out!I would agree with you there. I have a hunch too. Not new plugs but they looked good. Wires are a couple of years old.
check spring bind , retainer to valve seal, and rocker slot to rocker stud and rocker slot to rocker nut clearance
you bent a pushrod somethings got a clearance issue