These are some rough numbers, bit from what I've seen, you can expect to pay anywhere from $8K to $20K for a decent driver quality small block (318, 360, 340) car, with the earlier years and 340 being at the top of that range. A nice restored car will run you easily from $20K up to $60K-$80K, with the big blocks at the higher range. Vrts still command big bucks. Your best value will probably be a 72-74 Challenger driver with a small block and automatic. Sticks typically add about 15%. Like was said above, if you find a car you are interested in, research the crap out of it, and by all means look at it or have a 3rd party look at it before buying.