Hey David I am still half asleep but check out this site. The way I hear it the same guy designed most of these pumps and now owns one of these companies. If you can't find the info you need PM me and I will try on Yellowbullet.
http://www.product-engr.com/replacements.htm

1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time