Hi Matt, I like these cars a lot too. FYI, do a Google search and you can find lots of original cars that have been torn down and completely restored with good photo and text documentation. Really a priceless collection that leaves practically nothing untouched about these cars. I agree too, getting the proper year is important as the development was intense. The cars that had the frames completely covered were show cars for sure, but I like the ones you're aiming at and I've figured about 1966/67 is about the sweet spot. Maximum wheelbase 175" for the open cars, longer and they don't seem to be in perspective, my opinion. Good luck.