[cycleguy55]

More telling than raw HP and torque numbers, here's some published data on lbs/HP:

260 Cobras:
Sports Car Graphic May 1962: 1890 lbs, 260 HP, 7.3 lbs/HP
Road & Track September 1962: 2020 lbs, 260 HP, 7.8 lbs/HP
Car and Driver May 1963: 2120 lbs (full tank), 260 HP, 8.2 lbs/HP

289 Cobras:
The Motor October 1967: 2100 lbs, 271 HP, 7.7 lbs/HP

427 Cobras:
Ford Times August 1965: 2150 lbs, 425 HP (street tune), 5.1 lbs/HP
Car and Driver November 1965: 2529 lbs, 485 HP, 5.2 lbs/HP
Car and Driver April 1981: 2630 lbs, 475 HP, 5.5 lbs/HP

There are some real anomalies here, particularly when it comes to weight. I expect the Ford Times data is a dry weight, while the C&D figures are closer to 'as tested' weights.