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Being a turbo enthusiast, I whole heartedly can recommend that if you want to be over 400 at the wheels, you'll need to have another 10K after you build that engine. You need to do something about the transmission. You need upgraded axles if you plan on gripping. You need wheels and tires that actually are functional and have width and compound that'll hold. You need cooling and functional venting to accommodate the heat in the engine bay. You'll need to upgrade the turbo, because given the size of the SBD turbo, I'm sure it starts blowing hot air after 20 PSI (And you will need it, if you build the block and lower your CR if you want more power than you have already).
I am currently in the rebuild. I had the same aspirations, and have been humbled by the sheer investment cost with this platform. I will build my block and be happy with high 300s without needing a crazy driveline. The real advantage to a built block is that with the upgraded rods, you don't need to manage low end torque so carefully. This opens up a much higher safety margin for your tuner and they can gear up the car to roast much earlier if the turbo is up to it ( I'm sure the SBD turbo has no problem spooling quickly.)
So really, it is your car. We can only give advice, but I'd say just accept that this platform is not reliable over 400WHP for long anywhere unless you are hooked up.
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