does anyone no were to find underdrive pulleys for the sc400 and i am working on supercharging my sc and wanted to know what would be the best stand alone to go with all i know is it has to retard the timing confused:

 

a t i is you best bet

 

(Disclaimer--I have a SC300)
ATI is what I have 360 timing marks. So when you do get to that point makes it easier.
It has a 15% overdrive, because of its two piece design.
I ordered mine from Jegs.