Trying to get a wishlist of parts together

I'll do my best to keep this simplified, I have a 2022 WRX, no problems right now, love the car. My goal is to build the car to 600 HP, I'm limited to primarily 91 octane, and eventually e-85. It's a daily but I will eventually run track.

Current mods: Cobb stage 2 power pack ( Cobb Tmic, aluminum intake piping and charge piping) ETS intake with dry filter, awe touring cat back, IAG AOS, E-tune from mike at Getmtuned. I want to know with the wealth of knowledge on here what parts I need or recommended that will hopefully work with my current build, but open to suggestions. Car will be paid off this coming July, then I'm saving to do some heavier playing around. (Please comment on what I'm missing and or don't need for the goal) Wishlist: Block: IAG 1000hp with studs, (what can I use from my old block or do I need all new. ( I know it's a lot to ask, but recommendations for everything necessary to make it a finished block. Cams: I see some on IAG, is this my only option (recommendations) Downpipe: Catted ETS or whatever is recommended. Fuel: Ethanol kit from Cobb IAG injectors, and high flow fuel pump. Turbo: seen a few want to know what people recommend, seen tomiokaracing, any thoughts? From what I see there's is a factory housing turbo and the bigger 875 I think that says it should not need special hardware, LMK Heads: can I reuse my old ones or need special ones? (Recommendations or education)

Finally the core of the future build. Going to STI swap, might try to find a company that sells either new or find a transmission shop that can source me a reman, I know this includes having to find rear diff, front and rear cv axels. (What year is recommended) Will get a dccd controller anyone know a good source?

Input and recommendations critiques, any major parts that I need and or don't need would be greatly appreciated.

I'll look into doing suspension and such once I know what is recommended, I don't plan on slamming my car, or wheelcamber. This won't be done overnight, but Im really just looking to find out what I need and don't need. The block is probably (Overkill but I want to maintain some peace of mind on reliability. I don't beat on my car, but I know pushing this kind of power will kill the stock block quickly)