Don.....
If you read March's comments about not fitting the engines with the pulley as an integral part of the dampner...this means their Crank pulley sets won't work..but their individual pulleys will.
Take another look at thier page
http://www.marchperf.com/pg38.html
I don't use the stock dampners but March does offer the Water pump pulley in two sizes 6 3/4" and 6" diameter. I would measure the Crank (Dampner) pulley you have now and if it's 5.5" then I would try the part number 1912 (6 3/4") Water Pump Pulley or 1552 (6") and also the 137 2 11/16" Alternator pulley. You will need some fasteners that come with the set (1910) and won't come with the individual pulleys. If you need to check this setup just give the "Old One Stop Shopping" place a call (Thanks Zderf) and I'll loan you the ones you need to verify it will work....and the fasteners too....we have some nice round head bolts to handle the "Look"...if the parts don't work the way you want them to...well..... just return them....and I'll sell em to Zderf!
George
george@gessford.com