If you're going to turbo it, visit the sloppy mechanics youtube channel and web site.
It's pretty trivial to make 500, 600 wheel horsepower with a turbo and an LS engine, even a gen3 4.8.
Of course, it's even easier with an gen4 6 liter LY6
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Over my head"
1957 Chevy 3200, big rear window & 6 lug.
Front disc, power steering, Vortec 4.8 / 4L60E swap, hydro boost brakes & patina.