A lot has changed in 60 years.
For instance David Vizards Daughter Samantha, used to drive a mini on the road with what I believe from memory to be a 310.
Not convinced that an MG cam puts out as much as a 286, dyno figures simply don't add up, the simple truth is it depends on a) your driving style and B) the type of roads you frequent, whilst i wouldn't go anywhere near a 3.9:1 FD on the road, others would do, I also wouldn't use a 310, but having used the 296, 286, 276 and numerous turbo cams over the years I would say that for fun a 296 is up there, if it's too hard to drive on the road, then get a fiesta. !
I also wouldn't bother with N/A as you simply don't get the power & certainly can't match the torque output with an N/A unit, and you get to keep a lot of the drive ability.
Most people never even calculate their gearing, they never look at the benefits of fitting a matched FD ratio
All I am saying is it's horses fro courses and just because it doesn't suit you then it doesn't have to be dismissed out of hand !