I have about 120k on my car. A dealer over tightened and stripped out my spark plugs so I am looking at installing new heads. Was wondering what I should get for a decent streetable combo since I am going to have to tear the motor down that far. Should I replace oil pump? Timing Chain? Cam Shaft? Lifters? And what parts I should use and what heads I should go with. Not wanting to go all out, just something to add a little power..Thank you!