On my mild street car that see's the track only about once a year lately I have used this Pro Sport balancer I bought from Mancini. I have used them on three different street engines with no failures at all. I like that all my stock pulleys line up and it is SFI approved. I have had one on my 63 since 2008 and I drive it alot on the street. The ones I bought were all made in Austrailia. Ron

http://www.manciniracing.com/prosport1.html