Some zzp stuff you can source for less for the same or very similar items. Their sway bars and brake upgrades are good examples, especially used.

Service the transmission before you put a bunch into the engine. $100 for a fluid drop/filter and transgo shift kit is the preventative standard.

Personally, I did that 1st, then brakes, then suspension, etc. Everyone has their own route. Good luck starting your build, man. Welcome.