I can't advise on the supercharger, but otherwise, the M111 engine is super easy to work on. However I don't know if that is what you have. There is not much left to a "tune-up" anymore. I think it is actually a bogus term used by mechanics on people who don't know any better. There are filters. There are spark plugs. There are fluids. Those are the wear items. You could argue spark plug wires have some fixed life, but how long? A MAF wears, but there is no particular life span. There is nothing to adjust. No points, no cap, no rotor. I really feel there is no such thing as a tune up anymore.

__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra