at least in the US market, the 142E is the D-Jet fuel injected, same as
found on the 1800E.  The US market also had a carburetted model in '71 for
the 140 series, so a conversion to carb is probably not a major PITA.  Later
140 series fuel injected switched to the K-Jet system, a little more
straight-forward, but a little less performance than D-Jet.

There is plenty of science in the carb vs. FI discussion, plenty of personal
preference, and a tad bit too much religion.  For my own personal point of
view, the SU carbs are easy to understand and overhaul, the D-Jet is mostly
about tight injector seals, tight fuel hose pressure and seal clamps, and
clean throttle throat and throttle trigger.  When in good condition, both
systems are pretty reliable and responsive.  The B20E engine (for the 1800E
and the 142E) is high compression, a few more horsepower (assuming good
compression, which is questionable at this age unless the engine was
recently overhauled).  There is a ton of info on changing from high
compression head to less compression on other web boards, including
different manifolds and plugs needed to swap to carb.

James, I believe that with engine designations, "E" originally and
simply meant fuel injection.  "F" was introduced later as a reduced
compression fuel injection (mainly American market) and then "E"
meant high compression fuel injection (or unchanged compression- the
same "E" engine as before).  "A" was single carburettor and "B" was
twin carburettor.  (One exception was the six cylinder B30A was twin
carburettor.)

With the car model suffix, I'm pretty sure "E" meant fuel injection.
 "S" was for the twin carburettor.

Of course these designations came and went over various model
years... remember when 240s were sold as only "DL," "GL," and "GLT"
the year before the 700 was introduced?

D Jet fuel injection was in a few early model 240s in some markets.
This system was originally available on Chryslers in the 1950s, but
wasn't really a big seller.  Bosch bought it, made it a little
better, and then made some money off of it.

compression

as far as

injection

wrong with D

carburetor

James, I believe that with engine designations, "E" originally and
simply meant fuel injection.  "F" was introduced later as a reduced
compression fuel injection (mainly American market) and then "E"
meant high compression fuel injection (or unchanged compression- the
same "E" engine as before).  "A" was single carburettor and "B" was
twin carburettor.  (One exception was the six cylinder B30A was twin
carburettor.)

With the car model suffix, I'm pretty sure "E" meant fuel injection.
 "S" was for the twin carburettor.

Of course these designations came and went over various model
years... remember when 240s were sold as only "DL," "GL," and "GLT"
the year before the 700 was introduced?

D Jet fuel injection was originally available on Chryslers in the
1950s, but wasn't really a big seller.  Bosch bought it, made it a
little better, and then made some money off of it.

I might enjoy it too- I miss my SUs, the most excitement I've got out
of Motronic and OBD2 is a fault code when I lost my fuel cap :)