I'm by no means an expert, but a buddy back in the late '70s had one.
He beat that thing like a rented mule,and it never broke.
Oddly perhaps, I don't think he ever had electrical issues, either, but Lucas is legendary for a reason...
I'd say the proposed car's 5-speed and electrical mods would be wise improvements.
British cars are also good at leaking fluids, check into that with the seller.

You know the saying: happy wife, happy life.