Mustang Trivia.

What years did the Mustang used the 9" rear axle. This was a venerable design by Ford that is still popular with hot rodders and racers alike.
 
67- 320 HP 390, 355 HP 428 in GT500, 520 HP 427 in GT500 Super Snake

68- 315 HP 390, GT500, 360 HP 428 Police Interceptor, 335 HP Cobra Jet 428,

68 1/2-428 Cobra Jet 335 HP

69- 320 HP 390, 335 HP 428, Mach1, 325 HP 390, 335 HP 428 (with or without ram air), Boss 429 with 375 HP

70- 335 HP 428 Cobra Jet(base and GT500), Boss 429 had 375 HP

71- 370 HP 429 Cobra Jet with Ram Air.
 
Looks like you got them all even the one of one 427 car built to test tires !
other than that one built by Shelby there is no documentation of a 427 in a mustang - 428 yes 429 yes -Cougar yes
You are next
 
In the 1980 and 1981 model years, although a V8 motor was optional, it was not the 5.0 302. What was the displacement of this engine and what was the Horsepower Rating for the 2 years, (it was slightly lower in 1981).
 
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