Contact seller
Here is a very nice appearing low mileage 70 300, that looks like the cover car on the 1970 dealer brochure. The ad says it has a 383 engine now, so who knows why? It is also very low miles it says - 46K. Of course, the ad is almost worthless and there is no telephone number, so whether anyone will ever call you back after you email them is usually an issue with Craigslist listings. For you right coast folks:
http://philadelphia.craigslist.org/cto/4542085418.html
http://philadelphia.craigslist.org/cto/4542085418.html