at raceway park a couple weeks ago there were some nice cars 4sale. i have a 70 malibu and 71 ss, i like the 67s too but 70-72 body style a little better. it all depends on what your preferences are, how much your willing to spend, what kind of work you want to do. chevelles are alot better and faster than those supercharged weedwhackers that get hung up on speed bumps.
if your looking to go fast id recommend starting with a small block.look for a car with power steering and power discs, any year chevelle w/manual is a dog to drive, check the body mounts, check the frame for cracks and weird looking welds/patches especially in the rear by wheelwells, check the top of the a-pillar on the driver next to the windshield where it meets the roof for a crack going across, check the floors, 1/4s and trunk. floors and trunks arent usually too bad but almost every chevelle needs or needed 1/4s. id get a car that runs so that while im driving it i can work on it. interiors and paint arent too major because you can always get new int. for it and paint it later but look for a car that runs and a body thats fairly solid.
thats pretty much all i can think of right now.
im my opinion 70's are the best, 70 was the peak year for everything, mustangs, chargers, camaros, chevelles, gtos, cudas, it really comes down to personal preferences, theres positives and negatives for all years.
i have a friend who owns a shop and deals mainly in chevelles, hes real reputable and is pretty reasonable with prices. i dont know where along the jersey shore your located but from pt.pleasant/brick/toms river hes about 40 minutes north, from sandy hook/monmouth about the same. he runs across cars and parts all the time. i can give you his number if you want.
good luck with whatever you decide on.