The ProCharger comes standard with the intercooler, and offers a stouter intercooler (3 row I believe) that is recommended, especially when gearing to over 9 pounds of boost.
You can't do a complete custom tune with just a handheld tuner (you need some way to monitor wideband O2). I would recommend a trip to a good dyno tech pronto.
102k miles is a little long in the tooth for an ambitious new blower install, but if the tune is sane and spot on, it will be OK. If the intention is to turn up the volume to over 400 rwhp (which is potentially where you are with over 12 pounds of boost, assuming the fuel system is what it should be to feed the beast)...
I'd recommend an overhaul with forged internals, and some thought given to things like the rear suspension (LCAs in particular). Keeping a sane street tune in there would probably drop a few horses, but keep it from destroying things.
Much more power than that and you start having problems, including valve float as well as endangering the stock rods. These are actually pretty tough SMALL engines (keep this in mind when comparing to your much larger GM cars), but around 400-425 rwhp the stock parts start to show their limits.