You might want to take a look at my 1967 Barracuda restoration thread.
http://www.forabodiesonly.com/mopar/showthread.php?t=16153
I have pics of the tti exhaust and the cast iron manifolds I will be using.
I have done a test fit and everything fits great.
The part number for the exhaust system was 0200-A25MWM6769CUE
with line items E25LES and E25RES
These were ordered to fit c.i. manifolds 3418621-1 and 3418623
tti link:
http://www.ttiexhaust.com/PDF/Mfd casting nos list.pdf