It must have been 30 years ago that I read someone at Isky named Willie was doing this. It made sense to me at the time and still does. If you're going to play with the advance/retard of the cam, then you need to set the motor up to do it in the first place, with a Cloyes front cover....
http://store.summitracing.com/partde...1&autoview=sku
and Cloyes Hex-A-just timing set....
http://store.summitracing.com/partde...A&autoview=sku