If you got the compression down to 9:1, you could easily achieve those numbers with a setup like I use. Magnum exhaust manifolds and a Borg Warner S475 ($650 turbo) would get you there easy. You MIGHT be able to do it with one of the cheaper Chinese knock offs, but there aren't a ton of them out there with large turbine (exhaust) sides for a motor as big as a 408". You might choke the motor on the turbo before you get where you want to go powerwise.

Poly... respectively... A 71/75 would not make 1000hp on that motor, and you can find something that would work for a lot less then $1600.

The 408" needs quite a bit more then a 75mm on the turbine side to make 1000hp, and the 71mm compressor side would be absolutely set on kill to feed a 408" to 1000hp.

If you wanted that much power, The S475 I suggested with the 75/88 would be a good choice, or if you wanted more the Borg S480 with the T6 can be had for about $850. This has a 80mm compressor, with an 88mm exducer also on the turbine... Much better match for a bigger motor looking for 1000+hp.

The borg stuff is slightly on the heavy/large size, but they are about the best bang for the buck out there, and they are about bullet proof as far as turbo's go.