I personally will recommend against a supercharger, even a paxton style unless the engine was built specifically to withstand the extra power and higher compression.
To add anything like a supercharger or nitrous on an engine not purpose built for the extra stress or just an engine thats got a few miles on it is just asking for major problems.
Then you have to consider the tranny, the drive shafts, transfer case, rear end and axles etc etc etc.. as everything will need to be strong, other wise it will break often even if the engine can handle the extra power.
