I'm looking for this bracket. It bolts to the passenger side valve cover. The heater valve snaps into it.

 

Here's the diagram I used to make the brackets, have at it.

 

Thank you for this

 

If you’ve got a classic junkyard nearby, you might find brackets which would word from GM brands from your era. I’m using ‘70’s era brackets on my ‘66 425 and they work great at holding the plug wires and engine wiring harness.

Chris