Depends where you are in the country.
BigPhil for the North
TDI for the south
Advanced motorsport for the middle
All will give good advice. Links are on the homepage of the site
If you want to FI then minimum recomended should be brake upgrade so you dont kill yourself.
Clutch upgrade to take the power.
Piggyback ECU to tune the puppy up.
Really, you will need a new exhaust system too
intakes will come with the FI kit. But a new intake system is always good.
Millions of extra options after that. (coolers, blow off valves, guages, flywheels, leather driving gloves, etc etc)
Or you can then go mental and get new con rods, pistons, cylinder heads, cams, bearings, a new short block, 4.2L stroker kits, NOS etc etc