can a 2006 monte carlo engine fit a 2000 monte carlo ss

quite certain the SS model has a larger engine, the mounts may have to be altered a bit, but otherwise am certain such a switcheroo will be a success. You're going from a smaller to a little larger arrangement. steering column is not an issue. cannot think of anything other than the four engine mounts to be a stumbling block. Electrical...identical. fuel...identical...exhaust...well we'll have to look there may nave to do a bit of welding, but hell yes, you can do this!

same frame I would expect it to work.