Sub box, porting specs and questions??????

Want to build box something like this, fiberglass with MDF top (stole picture from Google)
Attachment 26540003
Attachment 26540004
Two 8” Subs require .6 cf per
1.3 cf total area built
Square port 6.25 “ wide X 4.75” deep X .75” height = 22.26525 sq. in.
Specs on Carsterio.com call for min 4.72” port length with 22.27 sq. in of port space
11.5 mm Xmax @ 37 hertz
Question # 1: Is this site’s calcs accurate for this setup?
Question # 2: Looking at the right hand side of the box, will the narrow passage leading to the port act more like a slot port or will this illustrated setup work?

@double 07

^ That guy right there is your best bet.

Good luck!

Thanks Famous. I have sealed boxes now but want ported. My space and what I want leads me to a square port. I will get with 07 if he will help. According to the sub spec I need 42.5" of port per sub ........this calc tells me 22.25" for both.......hmmmmm