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Doing some more research and asking lots of questions I have been told the following:
1) If you have the heater riser valve, then your right side manifold should have a flat flange, so the flat gasket is needed between the heat riser and the exhaust manifold. I believe the same to be true if you are using the spacer in place of the heat riser valve.
2) The other side of the heat riser valve uses a doughnut gasket as its outlet is tapered. I believe the same to be true if you are using the spacer in place of the heat riser valve.
The left side manifold uses the doughnut gasket since it mates with your exhaust system.
The above information is true of a 1966 Thunderbird - if not please let me know. Keep in mind, there are a few different right side manifolds made for 390 motors, some with 2" outlet, some with 2.25" outlet, some with flat flange, some with tapered flange, some with outlet that faces straight back parallel to the ground (for trucks), and some that exit angled downward (cars).
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