Engine wise, only a few things are usable; Complete engine, starter & heat shield, fuel rail/injectors, ECM . . . and some of the header studs. LOL
Engine & injector harness, PS header/X-over, down pipe, intake and piping, turbo, PS valve cover, etc. all need to be replaced . . . . . just too much work for *me*.
Read the sticky and you will find more info than you may care to know.
When people say "its worth it", its about power and associated parts availability. If all you are interested in is cruising and don't care about racing, leaving it HA will be the simplest / easiest / cheapest.
Send a PM to
@Boost231 for HA parts if you decide to go that route.
Good luck with it.