[Cobranut]

Chuck,

Check out a Romac damper. Mine is SFI approved and the high quality is apparant.
They're available in steel and aluminum.
It has the 3 bolt pattern for the March Ford pulleys too.

From Blue Thunder's website:

"Now available "Romac" billet engine dampners from Precision Cam Drives (maker of the "Rollmaster" billet timing chains listed above). "Romac" dampners feature:
*Fully captured S.F.I. spec. #18-1 certified with S.F.I. I.D. tag and factory serial numbers.
* Counterweights machined into balancer (NOT BOLTED IN) which can never come apart or loosen in service.
* All "Romac" dampners are splined or serrated where the metal contacts the high grade Neoprene Elastomer to resist outer ring movement. "Romac" dampners also have witness marks that indicate any slipage.
* All "Romac" dampners have a full 360 of timing marks so you can move your timing marker if engine modifications require it.
* "Romac" dampners are available with steel inner and outer, or with a steel inner and aluminum outer (where rotating weight must be as low as possible)
* "Romac" dampners are available in America for 20+ applications for Ford, Chev., Chrysler big and small block applications
"Romac" dampners are competively priced and have many extra features not found on other competing dampners. "

Good luck,