need info!

I'm about to buy a 2001 Subaru Impreza outback sport wagon, long ass name lol, but ik a bit about Subarus since I've help turbo my cousins brz and I've worked on a couple of bug eyes.

if anyone has or knows where i can find a head gasket kit with a timing belt kit as well for the car id seriously appreciate it!!!

I have to put head gaskets on it and and put the engine back in but after its running i plan on getting some coilovers and and maybe sum body stuff, like aftermarket bumpers etc. i just need to know more importantly when looking for aftermarket parts, what body model do i search for it and what parts for other models work with my car??? just tryin to learn more about it and what i could possibly do to it.