If you purely just want a number then yes, it's possible depending on the dyno you go to.
I mean, really a 20g just dyno'd 400+whp on this forum in FL this week. Anything is possible on any dyno.
But unless you're running close to 25-26psi on pump you won't get close even with a built block.
The only factor that will help you is either head work, cams or water/alcohol injection.
I have used the red before and it's a great turbo.
I personally did 435whp with alcohol injection at 25psi on a dyno dynamics.
Running a high flow cat and 2.5 inch axleback muffler with 3 inch dp and midpipe.