Is the intake bolt pattern same on all 350 Chevy engines Throttle body and Carburetor?

No, the intake manifold bolt pattern is not the same on all 350 Chevy engines, regardless of whether they are throttle body injection (TBI) or carburetor. While many share similarities, there are variations depending on the year of manufacture and specific engine design. Even within the same general engine family (e.g., small-block Chevy 350), different years may use slightly different bolt patterns or spacing. You cannot assume interchangeability. Always verify the specific bolt pattern before purchasing or installing an intake manifold.