throttle cable setup question

alright, so my problem is I still have my slant six throttle cable on my 360. I am not getting WOT with my double pumper on my 360. Its a weiand action plus intake. I will get the "hemi" throttle cable from mancini racing.http://chucker54.stores.yahoo.net/mohethcakit.html

mabe im just over looking something but even though the hemi cable has more "play" to work with than the slant six cable, the gas pedal still only goes soo far. So wouldnt the carb only open as far as it does now with slant six cable? is there a special adapter i need to get? how do i set it up a certain way so that i can get WOT out of my carb?