The answer to your specific question:
-Will the kit work for a 2.4L engine?
The problem with the 2.4L engine is that the CIS injectors are
mounted directly into the intake head. The CIS to EFI bungs
which are key to the conversion will not fit in the heads. They
are designed to fit in the intake manifold. One fellow is trying to
do the conversion on a 2.4L by making an adapter plate to fit
between the 2.4L heads and use a later year intake manifold
that has the injectors on the intake runners.
Have a look here to
see if your intake is the correct type.
Making spacers (or having them made) is easy and not very expensive - there are vendors already selling them for MFI, so you can just order them with CIS injector bungs. They look something like this:
I also believe you could source later runners and just block of your injector ports in the heads with properly sizerd bolts. They are cheap.