440 Duster swap

I am just gonna go TTI A body RB headers, and a manual box (PST or Southwest Speed....any feedback?). If its too much to steer, I will get the Epas. It is not a crazy expensive build, I just don't want to buy things twice.

If the guy does end up selling the Tri Y's before I am ready to order stuff then things would change of course.
Just fyi the tri-y will limit you to 475 hp the primaries are very small