It's a later one, '74-'77 as attested by the grotesque rubber bumper warts required to meet U.S. safety standards.
While the few TR6's of this vintage sold in the motherland were fuel-injected, American market cars (by far the majority of TR6's sold) had a pair of Strombergs feeding fuel-air mix to the slightly undersquare, cast iron, pushrod straight six, resulting in 105 SAE net horsepower from 152 cubes of displacement.
Acceleration, consequently, was hardly eyeball-flattening. Most tests reported 0-60 times in the ten-to-eleven second range. Still, everything feels fast when your ass is only inches from the pavement.
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