Superchargers are easier to install???
If it were me, I would do some reading on the subject.
Library books.

Find whichever one you can get as a kit, I think the old Typhoon and Syclone
S-10/Sonoma's had turbo'ed 4.3's, but don't quote me on that.

Both're pretty hard to install from what I hear. Turbos have to spool up,
but there're many different things you can do to play around with them. Get
a smaller turbine and it spools up quicker, but less gain and vice versa.
Turbos are more efficient because they're run off exhaust gasses while
superchargers are run off the engine. There're different kinds of
superchargers too, some put out a constant boost, others increase as the
engine speed increases (I THINK this is right but I'm not 100% sure on it).
Either way you may have to tap the oil pan to get oil to the charger (this
is more common with turbochargers then superchargers). And Paradox is right,
the Syclones and Typhoons had turbos. Myself, I'd look for a kit with a
self-oiling charger and go either way.

6 of 1, 1/2dozen of the other:

Turbo uses the still expanding exhaust gasses to drive the impeller to
compress the incoming air.  This is the source of the turbo lag and
the imparting of heat to the intake compressed air.

Lag can be mitigated with variable vane turbo's and alternate sized
twin turbo setups.  The imparted heat can be reduced with an inter
cooler.  But the increased intake heat combined with higher combustion
pressures will require knock sensors and a seriously strengthened
bottom end for reliability at higher pressures along with hardened
valves etc.  With a Turbo you can easily run from about 7-30 PSI of
pressure (whether the engine can survive those pressures is another
matter).

Superchargers provide quick response power, impart less heating of
intake air (all air that is compressed does heat however) and requires
less plumbing.  However, Superchargers constantly drain power (if you
are using them or not), Superchargers can be noisy (esp roots types at
higher pressures).  It is not as important but if you want an inter
cooler your choices are more limited (eg water to air), superchargers
also require clearance on the top of the engine as well as a drive
belt source location (Turbo's can be more conveniently located).

There's many many other issues with both systems that aren't listed
here.  But you've got to ask yourself this:

How much power do you need?  How much can you afford to spend?

Would you have room to install a small block?  (say a nearly new, used
Vett engine)?

You can get quite a bit of power out of the 4.3 even without added air
pressure, would you be willing to port, polish, balance & blueprint &
further tweak your present engine?

Turbo & Supercharging is best the domain of vehicle manufacturers
looking for more power from smaller engines.  

There is no substitute for Cubic inches.  If it were my money (which
it isn't) I'd go for a light weight small block and squeeze it in.  It
will be the most reliable, most efficient route to go.

that's my 2 cents.

Just drop a V-8 in it.  Direct swap, and about the same cost.

RJ in WV