I am using an original style radiator (with no filler neck) I chose to use an expansion tank (I think from a C2) so I could fill the radiator and also allow a place for the air to come out, This was not my idea but a suggestion from one of our members(thanks dennis Midyear) any ways I made a custom bracket and made my tank the highest part of my system. I just installed a T on one of the heater hose heading over to the heater core. I am also pretty sure I used the suction line (meaning the one going back to the water pump)
I will see if I can post a photo of my set up
I also removed the extra fitting on the expantion tank and welded it close.It was a 1/4 aluminum tube, I am pretty sure its a midyear tank.