Supercharger

Hhhmm. Very good question with a complicated answer. Will they do damage, well yes anytime you increase interior engine pressure you can do damage, however there are plenty of supercharged cars out there that have run for thousands of miles with nothing blowing up. Superchargering (or turbo) will reduce the life expectancy even if everything goes well just from the pressure increase. The weakness in these car seems to be the clutch however if you don't have slicks on the street tires will spin so it will reduce the likelihood of the clutch being melted. Most over the counter kits like Roush, Edelbrock etc.. are very reliable it when you change pulleys and re tunes and increase boost where damage is more likely to occur.

Apparently the internals are the limitation stock, you can't go above 450 RWHP or you'll blow it up. Just FYI.

I would be looking for a better mechanic that also knows about the 'tuning' aspect of the install