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Everyone so far seems to be correct. I swapped a I-6 in my 77 for a 360 out of a 71. All I had to do was move the motor mounts and swap the bellhousings. Overall it was a pretty easy job to do. Good luck
Besides the extra tire wear (from tire spinning when changing gears if not easy on the gas....), I'd say it's a good swap.
I did the same thing you are planning (see my gallery) and went from a 262 cu in 6 banger to an asphalt churning 460+. It makes the S-10's in my neighborhood wet their pants when they as much as HEAR me approaching (the trush mufflers really make the Lunati cam skreem....). I would say jerk out the 6 banger and use it for a mailbox or something and strap a big block in there....