seawalkersee
It needs a turbo...
First, what caused the bent pushrod? Next, can you do it when you are just idling? Third, compression check. Fourth, can you adjust the timing and change it? Fifth, when you notice it, in order to get the proper reading off of the plugs on something like this, you have to stop it after you have had it popping almost immediately. On a problem like this, when the idle and normal driving is okay, it can clear up the plugs in about a block (maybe less depending on the duration of the problem and severity). How much slack is in the chain?
SWS
SWS