TTI Exhaust on Early A's

We had to shim my 340 as well on my 1971 to get the TTIs to fit, and I did go with a new mini starter to provide more header clearance.
I believe you'll be happy with the "X" pipe. I have a video posted here:

http://www.forabodiesonly.com/mopar/video.php?do=viewdetails&videoid=64

if you're interested.