Newbie looking for advice

[AudiR30****bhp]

Hi all
I am looking for some help and advice if possible.
I recently bought a 1990's Audi coupe quattro project, its had an R32 forged engine built and put in with T76 turbo, hks components and the list goes on.
I am looking to try achieve around 1000 bhp with this build and obviously will need to upgrade the diff, gearbox, driveshafts etc so would welcome any expert advice on what parts could use from what vehicles, or even anyone that has these parts i would buy to get car up and running.
Thanks