Suspension Changes

[Bugger]

Hi, my name is Brandon and I live in Utah. I want to build up a bug, so that it drives better (faster, better handling etc.), but I do not have a bug currently. I want to chop/drop the top about 3 inches, and I want an oval rear window with the old w decklid etc, but I want better suspension than the older bugs have. I have found an old 57 baja that I could get the oval window from etc, but I don't know what year I should be looking for for the other parts. When does the suspension change on the beetles, do all bugs have swing axle rear suspension? Any pics and years/models where changes occur would be great. I don't want a super, because of the curved windshield and I think it would be difficult to put on the older front end.