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

That's a hell of a deal man! I would personally drop any motor you want in it like I'm doing to my scamp and just have fun it would be a fairly budget build by the sounds of it. Who cares if its originally a six car, or do up the six Clifford Auto has some killer stuff, they can ,make 11 or 10 seconds with good tuning and money, turbo etc. Good luck Deciding :)

But if you do hack it up let me know what you don't want. I could use some interior stuff off it etc.