I just sold my 1974 MGB last week....
Sold it to buy a nice 914. The B was fun, but a "city" car. At 60 mph you felt like it was was wound tight as a cheap watch. The teener is highway capable and actually likes it. The 5th gear makes a huge difference. Parts for MGs are everywhere and really cheap. the RB cars are really a different car. Emissions motor was even more anemic, ride height was raised for Fed specs, no sway bars made them really handle poorly. The list is long. There is a reason the RB cars are so much cheaper then the CB cars.