Are we discussing the piece that sits at the front of the engine
compartment.  The one that has (4) 1.25 inch coolant hoses with the
bleeder valve?  If so, I certainly would not try repairing it.  I bought
an '84 that had had that piece fail and it had a completely cooked
motor.  If that's the piece you need, let me know and I'll check the
local boneyard.  They have an '85 with full crankcase ventalation that
may still have it.

Jim