Thanks for the "welcome" - appreciate that. I look forward to this build very much.
Mopar4life - I spent hours looking at couplers/rag joints/ isolators.
Many choices. All expensive. Rick Ehrenberg never sold these - his words.
Many rag joints are cheap looking and usually don't offer measurements to at least feel good about the purchase.
The '72 and up ones are thicker by about a 1/4 inch - don't know if they fit bolt pattern (ish).
EBay to the rescue...yes $$$, but at least it's NOS, sort of, I asked seller about the age of the rubber.
These are manufactured later so not 50 year old rubber ...??? - his words.
I have bought from them before and they are excellent sellers. No worries their.
http://www.ebay.com/itm/400236804286?_trksid=p2060778.m1438.l2648&ssPageName=STRK:MEBIDX:IT
I bought one today. They have more.
I will post my post install evaluation if you want to wait 'till then.