nailhead 6x2 performance?

Tryed searching for this, but nothing came up. Im searching for 6x2 intake for my built 401, but was curious as to the performance, idle quality tuning and around town driving. I have heard good and bad things, but i want to get more opinions. i wanna run all 6

 

Ive got one Im puting on my nailhead a drag star never been on a motor in its life I to want to run all 6 but it will come down to weather I can find 6 complet ones