My 73 E just got a full mechanical rebuild from Jeff Gamaroth at Rothsport in Oregon. I spent $26,000 The RS spec Engine is awsome. Limited slip, drilled rotors, S breaks, original front mount oil cooler, new suspension, every thing is period correct and done right. the car drives better than the Original RS I drove. What do you think this upgrade did to the value of my car? Is it worth more with the Original E engine?