Both big block powered mustangs were champs at the track, but the Boss 429 could power the pony car from 0-60 in about 5.5 seconds, and make it to 100 mph in only 12.8 seconds. The 428 Cobra Jet makes it from 0-60 in 6.4 seconds.
390 cubic inches, overall lightweight and a 4-speed equates to a 0-60 time of 5.9 seconds. It can make the mad dash down the ¼ mile strip at 14.5 seconds, not too bad for an under dog.
The Mustang was a bit heavier than the Javelin, tipping the scale at over 3,500 lbs while the Javelin weighs about 200 lbs less.
Putting a valuation on a vehicle that is so old can be hard to do. There are a lot of factors that come into play–like the condition of the car and its originality. Unfortunately, most of the AMC Javelins out there don’t hold any value because a majority of them were turds and are undesirable except as parts cars.