64 dodge dart question

This'll give ya a start: http://en.wikipedia.org/wiki/Dodge_Dart

I'm a certifiable '64 Dart nut, but couldn't find the model designations printed in the time I spent looking.
What I know is that the 170 model was the "base" model, the "270" and "GT" models were upgrades, offering different trim and other options.
I'd bet that someone out there has listed the differences, but the only such breakout I know of is the original sales brochure.
I have one, but can't seem to lay hands on it just now. It's available for sale on ebay, but what isn't.

That link: http://www.ebay.com/itm/1964-Dodge-Dart-Sales-Brochure-/370656149464

google search for "1964 Dodge Dart" will start ya down the trail I followed for a while. You're welcome to dig deeper.

ATB

BC