Wieand 144 SC and March Serpentine setup?

[cgav8tor]

Hey,
Installing a WND 144 long nose SC on a '74 short water pump 350 block. I went with the long neck due to ample space/options and I want to continue the scenario with a March serpentine system & brackets (Alt & PS accy's). Unfortunately I came to a screeching stop: The March system came with a solid "blower dampener pulley" (@ 1" thick machined aluminum) vice a standard bowl shaped pulley and the SC came with a 3" solid aluminum spacer with expectations (my guess) of using a bowl shaped 2 or 3 V-belt pully. Obviously the stack off the crank will be too long to match up with the upper blower pulley. Using the amount of experience out there, is it necessary to use the dampener pulley on a serpentine setup with a blower? If I do, I need to get the solid spacer machined down the thickness of the dampener pulley. Or is there a 6-ribbed, 7" bowl shaped pulley out there I can use?