If it was me?
shift kit as mentioned, also #9 roller and reverse hub with longer splines, make sure I had at least 5 frictions jammed in the drums.
For what it's worth... I have the broader shift kit (transgo SK6) in my truck. It's a daily driver pickup truck and the stage two shifts perfectly for my usage, wouldn't have wanted to go much harder on shifts. For a more aggressive car I could see 3-5