68 small block w/ no ac. trying to get the deice working. the lever is there but no cable. when i get the cable where does it go and will I need any other parts to hook it up. The y vent is there. I need to attach to this somehow right?

Class - lets all turn our Assembly Instruction Manuals to UPC-1, process instruction details #M2, #M3 and #M6 :D
If you have the AIM there is a diagram of the heater assembly and the ducting is shown on the M3 page.
The instruction on page #M6 shows the cable routing and connections
This page also has the adjustment instructions IIRC ...

There are two (3) lever arms on the Heater Box assembly.
1 - is on the top of the box, to the right of the blower resistor - this is where the 'temp' cable hooks up (sounds like that's the one you're saying is there).
2 - is on the backside of the Heater Box assembly on the far left side - this lever is for the 'defrost' control cable. The cable hooks here and controls the position of the diverter-door that sends the air to the upper defrost vents or to the lower outlet to warm your toes.
3 - is also on the back of the heater box and controls the outside air inlet - this also controls the fan motor speed, the more you move the lever it opens the door more and increases the fan speeds.

There is an upper plenum assembly installed on the dash above the heater box that routes the air fron the heater box to the outlets in the dash top - this upper ducting has a small transistion piece that bolts to the heater box and the upper duct to funnel the air, these are often missing and can be hard to find. I think the repoppers now have it available though.

Hope this helps

I do have the AIM... somewhere. Awesome brother. Thanks. I'll be crawling under there this weekend. haven't really needed the deice much in CA but its been buggin me that it doesn' t work. Looks like the cables are only sold as a set at classic ind. I'll look around some more.