Big Block Crank Pulley Identification

[70ACBEE]

I have a 1970 super bee w/ factory AC
No power steering
No power brakes

The AC compressor requires two belts and the alternator one, but I still have a 4 grove pulley on there. I'm wondering if this is the wrong pulley. I worked the google machine but couldn't find a definite source for pulley identification. Help is appreciated.

Thanks

 

[beezee]

440 source has a chart to id pulley,s . http://www.440source.com/pulleyscrank.htm