Isn't it possible to even adapt the SU carb as a throttle body? I've seen MGBs done this way. However the cylinder head not being cursed with siamesed ports like the B (and A) series can take a better, more efficient multiport setup.
One thing that always struck me as interesting was that in the early 1990s when 2.0 injection engines became standard or largish cars, the outputs were typically around 120bhp - not very different from a 2200TC. It took 16V heads to get up to 140-150bhp a little later. And now you can get insane outputs with 1.2 litres totally reliably.
No doubt a well set up injection car would be considerably more efficient than a 2200TC and a lot smoother and nicer to drive. With a 5 speed box maybe touring at 40mpg?