Pulley set

I have a 1990 SC that spun the harmonic balancer. I have the replacement BHJ, but I am thinking it would be a good time to swap out the factory pulley set for a %5 under drive set - since I need to get the crank pulley balanced with the harmonic anyway.

Since the engine it primarily stock at this point I am thinking I don't want to go more than %5 at this time? The only changes to the engine that I can see are the previous owner had the cats removed.

So if someone has the required set of pulleys I'd be interested. Prefer at least the crankshaft be aluminum.

im guessing u mean u wanna overdrive the supercharger 5% ?

or u just want some accessory underdrives ? which consists of a water pump, alternator and crank pulley.

the SC overdrive is just a smaller SC pulley. or a 5% jackshaft pulley.