With the gas gauge being unsteady and a (possible) relay buzzing, it suggests a possibility of low voltage. (The weak magnetic field from low voltage would cause the contacts to open-close instead of locking in.) Ie. It still may be a bad battery connection.
The thick red cable going from the alt to the starter travels under the engine and sometimes rubs away causing a fire hazard.
Check that the ground from the battery to the engine block is solid (end connector) as well as the ground cable from the valve cover to the firewall is good. Injectors rely on a proper ground. Use a booster cable from the -ve battery terminal to the block and try starting car to see if ground is missing.
OBD codes?
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1980 245 Canadian B21A with SU carb, M46 trans, 3:31 dif, in Brampton, Ont.
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