you can not expect to throw a super charger on a ford six and expect 200rwkw
with out inturnal mods to the engine so their for you are looking at a lot more than $2500 pistons, valves, valve springs, ect, ect and they are very hevy.
the fj20det is a verry strong motor and will make more power with more reliability as they are built for the boost
and dont forget the sr20det