Pretty sure you could get a 301/4bbl with HEI in 1980. I owned an 81 TA with 301/4bbl HEI (non computer controlled). As you likely know, you could not get a 400 after 1979 in a TA, so if the 80 TA has a 400 it would not be original. I would go and check the engine codes/casting numbers/head codes/carb codes etc.
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