What engines will bolt into a 76 Jeep CJ7 in place of the 258 6?

You can replace the 258 6-cylinder engine in a 1976 Jeep CJ7 with several options, including the AMC 304 or 360 V8 engines, which are direct bolt-ins due to compatibility with the existing transmission and mounts. Additionally, small-block Chevy engines, such as the 350, can also be fitted with appropriate adapters and modifications. Other alternatives include modern options like the GM LS engine series, though this would require more extensive modifications. Always ensure that the chosen engine is compatible with your vehicle's drivetrain and emissions regulations.