I have a GM Goodwrench/Targetmaster 350 motor (casting #10066036) in my 70 Malibu Convertible. The engine was purchased new in 1986 I believe and since then it has had about 15k miles put on it. I purchased mid length Hedman Headers, Eldebrock 2101 Performer Intake and Holley 650 carb. What inexpensive parts can I add to spice it up even more. Not looking for a race car here...