This maybe apples to oranges but I turbocharged my 1980 Fiat Spider over 10 years ago. This is the second system I've built. I originally used an old Rayjay found on the Corvairs but it created too much lag. So I'm using a T3 with internal wastegate and log style manifold. No decrease in power over the old system, just quicker boost.
Some engine specs: The engine is a stock 2 liter with factory 8:1 pistons. I run seven pounds of boost with the stock Bosch L-jetronic system. I believe Ford used this same system on their 2.3 liter engines back in the 1980s.
The only mods I've done to the injection system is a rising rate fuel pressure regulator and a pressure switch between the ECU and O2 sensor to prevent the ECU from leaning out the fuel mixture under boost.
The ignition system is control by a Jacobs Boostmaster which is no longer available. But I found if you re-route the vacuum advance hose to the intake manifold it will work as a boost retard system to some extent. Not ideal but quick and dirty.
The only issues I can say is the valve guides/seals seem to take a beating. The pistons have held up but I had the cylinder head rebuilt a few years ago. It seems bronze valve guides and the exhaust seals don't like forced induction.