As stated, this Barry Grant 850 came with #85 primary jets, #93 secondary jets and a 6.5 Power valve. I figured that these were virtual copies of the Holley line with a fancier finish.

I was looking on the Summit site and saw that the Holley Street Avenger 870 comes with #78 primaries, #82 secondaries and a 4.5 PV:
http://www.summitracing.com/parts/hly-0-81870?seid=srese1&gclid=COP_-4CDrLkCFYU5Qgod8VsAzA

Huh? A carb with a higher CFM rating has smaller jets and power valve?