The Dougs D-450 are 1 5/8's primary tubes into 2 1/2 collector and will work with your mini statrer. The TTI's are a stepped header with 1 3/4 primary with 3" collector and must use a powermaster starter. TTI also make a complete exhaust kit for an early A, but maybe can be modified to fit the Dougs. Both sets are costly, but hey it's only money!
I have my TTI's on order for my 65 Cuda so I can't tell you about fit on either set.
Check out http://www.forabodiesonly.com/mopar/showthread.php?t=9376&highlight=early http://www.bigblockdart.com/index.php/topic,185.0.html
