What the other guys said. PLUS - Pull up the floor mat in the driver's and passenger's floor.
A chronic problem with 122s is water leakage that comes in under the windshield and runs down the firewall.
It gets into the jute backing under the rubber floormats and the jute ferments.
The resulting fermentation products, like vinegar, rust the floor through from the inside.
Floor panels CAN be replaced but it is a lot easier if they are sound at the edges,
so you just patch the holes.
220 is a prime candidate for an overdrive, which makes high-speed cruising MUCH more comfortable
and a bit more economical. The M41 fits fine, and either the D-type or J-type work OK.
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George Downs, Bartlesville, Heart of the USA!