What do I need to do to build a 1000hp turbo small block

Very nice car! The 15K budget won't build a 1000HP motor here in the U.S., so I doubt it will down there either. For 15 grand if you build it yourself and don't have to spend a ton on machine shop work, you can likely build a very strong and reliable 550-600HP MOPAR motor. Then throw a 150 shot of nitrous at it if you need more.