The definitive answer, as stated, is to put a fresh install on your SSD. however, this means you have to spend a lot of time reinstalling stuff.
If you plug in two drives which are bootable, you'll get a choice of which drive you want to run. Once the selected drive runs, you can run all the programs installed with that OS.
If you feel more confident, you can try cloning software.
Look at the forums, a bunch of people are discussing this right now.