I think maybe you are spot on Grumpy, that was my thoughts as well....what we need now is a member with an early 14" SB with to post here the numbers on his air cowling so as we can narrow down perhaps what is presently on this machine. Joe Carroll may be able to help here.
Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member. Kindest Regards, Darryl