1973 Duster Big Block 4 speed
You have a lot of work ahead of you.
I did this to my duster. Be ready to install and remove the engine abou 5 times lol
Here was my build so you can see some issues I had.
http://www.forabodiesonly.com/mopar/showthread.php?t=33454
Have you done this befor? It's a fun build.
Brewers performance will be a friend when it comes to the 4 spd stuff. If you stay mechanical linkage that is.
Good luck!