My thinking, hard to justify 'building' a 383 using a 58-year-old 2-bolt main block when you can buy a new one with a warranty.
GM Performance lists 7 different 383s, all with a 24/50 warranty. A bud recently bought a Blueprint 383 for his '68 RS, super happy with it. Blueprint has its own block castings.
Unless it is an original engine for a restoration, there is no reason to have a shop build an engine these days.
Pay more, get more.
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