Have 340 swinger and 71 scamp... Do i cut up scamp 4 dart? Or build 340 scamp clone?

build the 340 swinger, and sell the scamp to someone who needs and will appreciate the car.

I'll second that. I also agree with Gryzynx. Once you get to cutting that Scamp apart, you're going to wish you had new sheetmetal. I've been down that road. Plus, how many Scamps do you see at car shows compared to Darts? Would it be possible to sell the Scamp to buy some sheetmetal for the Dart?