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Then how would you cover up the wind noise?
How much of the sound deadening that was originally fitted to the car is still there? If it is gone, reinstating it might make a difference.
Certainly on my 1977 1850, the largest amount of noise at 60-70 mph is wind roar. But then I have overdrive and the later very complicated (and restrictive) exhaust system. The bulkhead in the engine bay should have sound deadening material glued to it. I don't know what would have been under the carpets as standard. I have actually removed some of the material on the driver's side of my bulkhead because I had to do some repairs there. I can't say the car is any noisier as a result. But compared with almost any modern car it is noisy inside.
There should be deadening material on the transmission tunnel, the footwells have some sort of bitchumen material glued to them, I also found some bags of sound deadening material in my doors when I took them apart (don't know if that was standard).
One thing that would make a difference is putting deadening material underneath the bonnet, most modern cars have it, just make sure it is fire proof.