Hard to tell if it's a "good deal" or not. I agree with most of the comments so far. The roll bar tube over the tunnel is extremely unusual- but maybe the seller's Ebay username ("fabperson") provides a clue.
It does look like a clean car in the pics, and even if the seller did most of the work on the car himself (i.e.- no labor cost), he's still probably not making any money at that price.
That being said, I wouldn't pay anything close to that price without going over the car very closely in person.
You need to ask yourself what the ultimate purpose of the car will be. If it's to run vintage, then it would probably be a fun car, but as others have mentioned, it will not be a class winner- not even close. If you're looking for a track toy or car to do driver's schools, etc, it would also be alot of fun. It's obviously not legal for SCCA ITB (big brakes, etc), but it could run in NASA and have some good competition depending on your location.
As point of reference, about a year ago I bought a 71 2002 that was built to SCCA ITB spec. It's not cosmetically nearly as nice as the car in this Ebay listing, but it's mechanically sound and a TON of fun. I paid spent ~$4600 including delivery for my car- and I am very pleased with my purchase. I don't plan on racing the car in SCCA, though I might run it in NASA some time in the next couple of years.