u might be able to use a smallport dizzy as a CAS just fab up a cap it
Have a look in ur CAS see what pickups how many tooth wheels then compart to smallport, i know the smallport uses a 24 tooth wheel and a single tooth wheel, 2 VR pickups 180 degrees apart on the single tooth wheel... if your lucky u could use a smallport dizzy and just wire it up right
Just a thought...
My ideas expressed in this post are purly ideas and should be taken with a grain of salt