Wow, my first post on Adv scrambler thread. Just got a '06 Scrambler and loving it.
Boola Boola, you might want to checkout this link:
The XS650 hotrodders have spent a ton of effort to create 270 motors from the OEM 360 motors. They refer to it as rephasing and it seems to be condsidered the height of XS650 performance mods. We lucky scrambler owners get the 270 ready to go.
Black Cat, not sure if your looking for new or used. Here is dealer with a new 2012:
I had been looking for months for a carbed Scrambler, was getting desparate and was considering driving out of state to get one, when low and behold a great deal showed up 15 minutes from where I work in SF. Keep looking something will show up.