TTI Headers before Trans or after ???

Put a set of TTi's in my 74 dart , Was a six banger but used the shumacher mounts, ( they work great) put 360/727 in it . Put headers in after motor and tranny. Passenger side is a cake walk. Drivers side had to lift the engine a couple inches. However, I did it by myslelf, on a set of jack stands on garage floor and only took about 2 to 3 hours and was done.
Was kind of leary of them at first due to price, But have become an absolute believer. Would never even consider any other headers for a mopar A body. I love them as much my Dart does. One thing to make sure of. Use a mini starter, you can put it on after headers and if you ever need to change it, Headers can stay in place.