Single Lower Pulley

The '68-'69 lower pulley has a different offset then the '70 up pulley. If you run the '70 and up aluminum water pump and '70 up alternator brackets you can run the later pulley set up. The water pump pulley is different on '70 up also but it is available new:

http://www.bouchillonperformance.com/BPEpulleys.asp

I have a single groove '69 crank pulley that has been sand blasted and painted. If interested send me a PM.