1) What's the labor in hours to replace the super-charger belt? I think I hear it slipping when I nail it.
It takes about thirty seconds and a 1/2 drive ratchet.
As for belt slip, changing the belt may help a tad, for awhile, but getting 100mm idlers (to replace the stock 90mm) can help. But the best way to minimize belt slip (other than getting a cog setup) is to get a Magnum Powers idler bracket.
The MP setup is better than any other Metco style of idler bracket setup because the MP idler bracket wraps the belt on the snout pulley from the proper side.
The MP wraps the belt from the drive side of the pulley, instead of wrapping it on the release side of the supercharger pulley like the Metco bracket does.
2) How hard is it to install the (outside) drivers door handle with a 04 version that has the programed buttons?