Drag: Have motor and trans, but which car?

Well, I'm on a pretty low budget, is there a huge difference in weight between one of these and a 67-72? This is something to just toy around with in the garage and at the track.

http://bloomington.craigslist.org/cto/1242837564.html
1975 Plymouth Duster

http://bloomington.craigslist.org/cto/1242645933.html
1974 Dodge Dart Swinger

Which would probably be the better of the two?
:dontknow: