i dont understand why you are still wanting to make your own and need dimensions. i told you two places where you could buy pre made kits that FIT without having to do anything. you pick which manifold you are running and what flange you need. its really easy. you must need to be spoon fed... oh well im in a giving mood....
http://www.spoolinperformance.com/eg...ping-p-64.html

and this is the one off ebay i told you about
http://cgi.ebay.com/ebaymotors/SRE-I...spagenameZWDVW