I have a 1965 Ford Mustang fastback and I purchased a distributor on Ebay that is actually not for a 1965 has promised but the code appears to be for a 1970 Ford mustang. The casting or stamped number is D00?-12127 AC, I'm trying to find out what this single vacuum advance distributor actually fits based on this number if anyone can help. There is no forth digit on the first group, I'm not sure if it wore off or ???.

 

Google is a wonderful thing. Look at this site. http://mustangtek.com/FordandMustangdistributors.html
You distributor looks like it might be this one DOOF-12127-AC, 70-71 302 Torino Mustang Falcon 2v AT Imco, Single points. That will work in a 289.