Sounds like it might be a 73, or perhaps 74. But I’m no expert. Several experts here, however, including Okie. They should see this question in a few minutes and give you an answer.
But know that the only information that a VIN shows on a bronco, are the model type, engine type, manufacturing plant, and sequential serial number.
All other pertinent information is on the warranty plate on the glove box or kick panel.
And a Marti report will tell you all the rest.