So a bit of a back story as i lurk around alot i have a 88 cutty that has 24k on it and is in 100% original condition and as near perfect as it gets with out being perfect. My problem comes in that it has an exhaust leak, a preatty bad one at that, sounds like its comming just south of the headers to me not sure havent investigated much. Im not sure if i want to just get it fixed and leave it as stock as it was before or if i want to upgrade it a bit and put a new carb maybe a set of heads and a cam while im at it what kind of gains do you guys see typicly and/or would the car retain later collectibility and value staying stock?