Take a look at leewah's car on these forums, has around the same power you are after and has run a 10 second quarter with potential to do 9's, and openly shares the specs of his engine.
If you really want an off the shelf engine, Prospec in the UK can arrange to send you a Top Secret built engine with the following specs
Cost? A touch under $34,000 plus shipping... yes thats how expensive off the shelf engines are, and you still need to purchase turbo, intercooler, fuel system, suspension etc after you have the above engine in your posession.
To my knowledge the largest off the shelf engine mines sell is capable of 600ps. Youre looking at around $28,000 for this, and you need to ship them your existing engine, or get them to purchase on your behalf an N1 block.
For the above mentioned prices, you could find a reputable local builder and build something just as good and probably save a bit of coin in the process.