Carb Question

http://www.summitracing.com/parts/hly-0-8007

The above carburator is what the Summit sales guy talked me into on the phone. I argued with him but he insisted that for my 273 it was the carb I wanted. I bought the chrysler throttle adaptor and secondary tuning springs and a couple other tuning parts with it. Now I wish I would have waited but this is what I have. Ironically, it is one of the most expensive carbs in that particulat Holley family.
:-( DR