360 block, how thin ?

Thanks everyone. To answer some of those questions. I feel "Magnum" in sonic test had too many thin bores on the sides, "Dugans" even marked "rusty in 3 places,(a first).408" will need to make 500+hp,(all motor), street/strip.Engine shop I use,(Southwest Engines), is easiest way to purchase block, but they don't sonic test. I'm leanin to Scat for rotate assem. "May" build smart, hemi heads.Own a machine shop. Art.