Installing Ubuntu 14.04.3on multi hard drive system

[Jim Byrnes]

I just added a 3d hard drive to my system so I can slowly migrate to 
14.04.3. sda = ubuntu 12.04, sdb = windows 7 and sdc is the new hard 
drive verified with gpartd.

When I boot from the live cd and choose to install ubuntu sdc is not an 
option so I choose "something else".  The next screen shows me sdc so I 
choose it.  sda is shown as the choice of where to put the boot loader.

I want to install 14.04 on sdc and keep booting to 12.04 by default 
until I get 14.04 setup to my liking.  So is choosing sdc and leaving 
the boot loader installation on sda the correct choice?  It's been 
awhile since I have done this and don't want to mess up my system.

Thanks,  Jim