Anyone using 3.5" oval X-pipe???

Im interested in purchasing a 3.5" oval X-PIPE, from Ram air restoration along with either 12' or 16" Spintech muffs, to 3" tail pipes out the rear for my 65 B body. Its a 500" RB cast headed engine. I have 2" primary into 3.5" collector.
Has anyone used this set up at all or heard/seen anything like so???
I would appreciate any comments or help regarding this ASAP, being im ready to make a move on an exhaust system.
I am unsure of the muffler size but leaning to the 16" being its mainly a street car.
www.ramairrestoration.com
thanks for the help brothers!

I think Stu might have one hanging in his club house , not sure he would part with it though because its the first "oval" X pipe ever made

Any exhaust guru's out here?