TTI Headers before Trans or after ???

On an early a body 64 Dart with a 727 I had to turn the trans sideways to get it in past the headers. I went ahead and put the headers on while I was lowering the engine in and left the trans off.

I mocked up an empty case to support the engine while I buld the trans and I had to turn it about 30 degrees to clear the headers. ouch.. this is gonna suck when it is complete with the convertor. I have to put it in on my back on the floor so I know it is gonna be a bear! :p