On the heat riser: The best thing I think to do is remove the innards, and weld the holes shut from the inside. You have a piece that looks authentic, but no troublesome flapper. The biggest problem with our Birds is heat, and a sticking riser is a big cause. Your car will start, warm up and run fine without it. No restrictions in the exhaust means cooler running. Also, try some anti-seize on the manifold to exhaust pipe threads, and exhaust connections. You will thank me when you take them apart later on.
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