Ok I found your build thread and read through it. Your truck is super bad ***. But there was zero information about the engine build. So I’ll ask a few questions. Fill me in and I can run some numbers on turbo sizing.
1. What fuel?
2. Compression ratio?
3. Power goal?
4. Max RPM?
5. Weight of truck?
6. Cam specs?
7. How much boost?
So far I know 408 cu/in, single plane, blow through, no intercooler.
I use Garrett’s turbo sizing form as a guideline and it been pretty close for general sizing.
