A few quotes:
The New York State Police were given a special 1968 Plymouth Fury I that had a 426 Hemi engine in it, dual carbs and all. It allegedly reached reached 155 mph speeds in straight line testing on the I-81 Northway. The SP rejected it due to the dual carb set up, poor mileage, and high cost of the engine option, as I recall.
The Ford 429 was fast, but a good 440 would easily whip the 429, 428, and probably run close to the full bore 427. Most police units were equipped with the 390. A 383 would eat them for lunch, out drag them and run them out top end. I don't know why. GM and Chrysler always had more "pop" in stock form than the police edition Fords.
Ford never did well, not so much as to the engines or speeds, but for their poor braking performance. Some testing agencies rejected Ford out of hand due to their brake deficiencies. Once speed is achieved, it is a matter of stopping, and I know from experience that Fords were shunned by patrolmen, given choices of other vehicles.
That's right, the Bluesmobile had 275hp. So I'd say it was probably LT1 B-body speed.In 1974, there were 15 police engines, including a four-barrel 360. On top was the 275 hp 440 and a 250 hp 400, available in both full sized and intermediates. The Los Angeles Sheriff's Office found the 440 to beat the Matador 401 and Montego 460; the 360-equipped, 200 hp Dodge Dart squad outran a 350 cid Nova, running from 0 to 60 in 8.1 seconds.