Like Mike Kucaba said, Lemans Minitures had a great GT40 in the Goldline series, (very expensive), very detailed. Fujimi models also make great looking curbsides.
Go to my fotki link and I have 2, the 69 gulf colors and the Lemans winner.
Models: Usually internet, mainly ebay.
Paints: Advance Auto, Pep Boys and Walgreens. (nail polishes)
Supplies: Different hobby shops we visit when we go over to the states to attend model car shows. Usually I stock up for a whole year. (We are a team of 3 or 4 that haul from Puerto Rico to compete in shows in the USA)
George53, The taillights on the 70 Dart were single taillights on each side, when the 71 Dart came out it had 2 smaller taillights on each side. Hope this clarifys it.
This is a great model to work on. Only thing about it is the fitting of the panels when using the vinyl lines. Maybe You using the braided lines will have more space to deal with putting the panels on and off. Another thing to keep an eye out for are the tires, they tend to just break in half. If this happens pm me, I had to make molds and make copies of the tires in order to finish mine.
I built mine out of the box, it's on page 8 of the underglass section.
Keep posting your work.