Car started knocking the other day and has got much worse. I guess my question is what is my best option? Trying to stay as cost friendly as possibly. This was a really powerful motor and I hate that this happened. Car has PI swap, 60 lb injectors, c&l intake plenum and throttle body, bored .030 over, powerdyne supercharger, steed fuel rails, o/r x-pipe, etc. etc. I was thinking it may be best to swap for a Mark VII DOHC motor? So give me some options and around what price it would cost.