Trade 68 Formula S for?

My advice. No No No! Don't sell it. Don't trade it. You will regret it. I see your SIG; I love that car. You will regret it. The love will come back. My motto is this:if its not costing you anything then don't get rid of it. If you lived closer I would help you pull the engine and detune it. I'm fifty and hate doing all that stuff. But I have replaced the rear axle, springs, driveshaft, torque converter and added a shift kit. My 318 is out and sold and my 340, that I built in my garage, is ready to go in. It has taken me a year and a half. I am looking forward to the high strungness. But it is and has been tiring for me.
Keep that car. There are so few around. And I hope nobody trades you or buys your car. Its been in and around your life to long. It would be like losing a family member. Take care.