Happened to read a 1970 roadtest on the Challenger T/A,with the 3 2bbl.340 engine. It was stated that even with the better intake and 3 carbs. and better exhaust,the HP rating was still 275,just like the standard 4 bbl. 340 in the regular Challengers and Cudas. But upon driving it,and testing at the strip,it was more potent than the standard version. Shades of the Bullitt,wouldn't you say. It ran 14.20s at 99-100 MPH with 3.55 gear.