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Will a 1970-75 Pontiac trans am automatic transmission engine block bolt up to manual transmission?

No, a 1970-75 Pontiac Trans Am engine block designed for an automatic transmission will *not* directly bolt up to a manual transmission. While the engine block itself might be the same casting, the differences lie in the bellhousing. The automatic transmission bellhousing is a different shape and bolt pattern than the one for a manual transmission. You would need a different bellhousing to mate the engine to a manual transmission.