If you do decide to reinstall the L-Jet, make sure you replace ALL the vacuum hoses. Test ALL the temp sensors and use new seals for the injectors and the intake runners. Then, and only then, will you have a fighting chance.
L-Jet is super touchy to vacuum leaks. The gasket on the oil filler cap needs to seal tight or it won't run right.
And...FYI: Albert Correia, who runs a very fast 914 in the Bay Area a/x's, has the Webers off his old 2.0 on his 1.8 without any adjustments and it makes loads of power on the stock cam.
I've seen it, heard it and ridden in it first hand, so the carbs vs. stock F.I. debate
will rage on.
I like carbs better ( right now ) because problems are almost always related to dirt in a jet. Where F.I. problems usually prove to be a little more complicated to track down. ( and $$$ )
That said, I had zero problems with my D-Jet on my 2.0 FOUR, zero problems ( after tuning ) with my Webers on the 2.0 SIX I run now and
nothing but problems with my L-Jet on my '75 1.8.
And you can borrow my spare L-Jet ECU from a '74 if you want.
KT