Classic Datsun Motosports raced a 1200 coupe for a while , they are in Southern California. You'll find most places have played with 510's and Z's but very few have 1200 knowledge. Dave Turner in San Diego (not Dave Turner in Temcula) used to know 1200 stuff but I don't know if anyone still there does.
Don't know if your local but if you are in SoCal and planning to Rally with CRS (California Rally Series) the stages are rough even the gravel ones we have here in Vegas will always have some wash outs or huge rocks.
$550 is a good price for a 1200 as they are getting tough to find.........the $150 beaters are long gone. I would pick a sedan over a coupe for Rally as a sedan offers more room in a roll over. For CRS Rules a 1.2 liter car is a big disadvantage as the class limit is 2 liters. Just remember it's cheaper to buy a Rally Car than build one.

Tom

Tom