Let's put a mild 8.2:1 360 on the dyno.

stock hi compression Dart 340's were only 275 h.p. and with gears and a converter were very quick on the street.
..300 hp and 350 ft.lbs in a light A body is just fine!
275 advertised for insurance purposes, I saw a Dyno pull of a 70 340 stock, highly tuned was 300 hp
Another member stated that he had a discussion with a Chrysler engineer who stated that it was 320 hp