Holley vs proform

so i am was looking to buy a new carb for my 340 and was wondering whats the difference between 750 Holley Ultra Double Pumper and a street series 750 proform carburetor
are you paying the extra 100$ for quality or just the Holley name ???

Holley 750

http://www.summitracing.com/parts/hly-0-76750bl


proform 750

http://www.summitracing.com/parts/pro-67213