Wild guess here 411A, but the old Braniff training school at DFW use to have a 74 sim and provided type ratings. Does the name of Dalfort ring any bells, that was name of the place when I got my training there.
They were bought by Flight Safety when FSI had the Boeing training contract, however, I understand that all of the FSI Boeing training centers have reverted back to Boeing. So I really don't know the status of Dalfort now.
Hope that helps.