Ivybotter,
The blocks you are describing are only available in the FTC software that shipped with last season's KOP. This season FIRST suggests that teams who used NXT-G in the past to use it for initial testing and prototyping, but they recommend you to move to LabVIEW or RobotC for full competition support.
I highly recommend you and your students spend the time becoming familiar with the fully supported software (for example if the old NXT-G blocks don't play nice with the FCS no one from LEGO or NI is going to fix it
). Since you have used NXT-G in the past LabVIEW will probably be the easiest software to pick up. There are a lot of training resources on the web for LabVIEW including the FIRST Community on
www.ni.com/first and
http://ftcmastery.com/. If you have any questions regarding using the tools or if you run into issues feel free to post of the forums at
www.ni.com/first.
Cheers!
Mark