[sparks]

I am trying to decide what would be a better benefit . Getting my new M.demon carb in a couple weeks for my 427so w/mild cam. It has the 8"x2 3/8 stellings on there now. MY options are
1)going to a 10x3 1/2 w/no spacer.
2)keep the 8" stelling and use a 3" fillter w/a 1" spacer
3)go to a 9" x3" filter and use the 1" spacer
I guess what i am trying to ask is a spacer going to help the car more or is a bigger air filter. I was told that 6cfm per sq. in. on a k&n ? I wanna keep it fairly orig. lookin...Thanks