Don't mean to derail the thread with an offtopic post, but no real Cobras came with the 429.
They came with 260, 289 and 427s that I know of.
There also was just one prototype 390 all aluminum racing Cobra. It's the engine Carrol Shelby wanted to use after the 289 but Ford insisted in using the cast iron block 427FE side oiler which was much heavier. Let it be noted that The Cobras that won the Sports car world championship were the small block 289 HiPo's. The 427 may be a street legend but it never won a championship with the Cobra other than drags, where it set several world records. The prevailing wisdom of the day back then was high HP with a big block, because that was the only way to get over 400 hp back then. The 427 was terrible in the Cobra as a sports car because it weighed 300 lbs more than the small block and put all the weight where you didn't want it, in the nose of the car. The Cobra lost it's fantastic handling. Now you can order a 427 FE from Shelby American that is all aluminum that weights the same as the 289, add a blower or turbo or fuel injection for more power, Things you couldn't do easily in 1965. The 427 FE did very well in GT Racing in the Ford GT 40 winning 1,2, and 3rd place finishes in LaMans, but it was a mid engine car that distributed the weight properly. What's in MY Cobra replica? I have an 87 Mustang 5.0 with a bunch of racing parts on it putting out around 350 hp. In a 2000lb car it screams. Here is a picture of me at a road racing track day with it.
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