You'll want to swap your drives around putting the SSD where your HD is now and put the HD in the PATA to SATA carrier in place of your optical drive for the best setup.
You will need to extend the HD thermo sensor wire to reach over and put the optical drive thermo sensor onto the SSD. That way the sensors make sense when you are reviewing them in monitoring software.
Here's the IFIXIT guide for the dual HD kit. [guide|8975|Installing iMac Intel 24" EMC 2134 and 2211 Dual Hard Drive]