A friend of mine had his old Porsche 911 3.0 SC engine converted from an old mechanical to a moden electronic fuel injection system.
No longer original, but pumping out a lot more useable power at a wider rev range, cutting the fuel consumption by at least 30% (the old system was tired), and over all making it a much easier car to own and use (it was suddenly even running smooth at cold start)....
It is now even possible to find people who can service the thing who is not in their late 70s.
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