Join us on Facebook: Search for 'ConcoursMustang' Private group!https://www.facebook.com/groups/concoursmustang/Indiana SAAC Fall Classic , French Lick, IN Oct 11-12http://www.insaac.org/SAAC National-Sanctioned Concours Event
My research indicates this would be the correct stamp, but it could also be a “V”.
Did you look in the library for distributors by year and engine?
Side note...Jim, your workbooks are a wonderful resource and I cannot thank you enough for the time you must have taken to put them together and sharing them,,