Well I got it to work with RetroPie SD-Card Image V2.4, small, BETA!
http://blog.petrockblock.com/download/retropie-sd-card-image-v2-4-small-beta/
Im just using the jzIntv that came with the image, copied the hackfile, and put this in the es_systems.cfg:
<command>/opt/retropie/supplementary/runcommand/runcommand.sh 0 "/opt/retropie/emulators/jzintv/bin/jzintv --kbdhackfile=/home/pi/RetroPie/hackfile.cfg -z1920x1080,16 -f1 -q %ROM%" "jzintv"</command> As you can see, the folder that jzIntv is in changed in V2.4 small beta.
Not sure why I couldn't get RetroPie V2.3 to work. But I think I might look around for another microSD and try it again.