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Ford developed two high-performance street versions of the 429 between 1969 and 1971, the Cobra Jet and Super Cobra Jet. The Cobra Jet (429CJ) was fitted with a Rochester Quadrajet 715 cu ft/min (20.2 m 3 /min) Spreadbore 4-bbl carburetor, a larger camshaft; a special set of cylinder heads (DOOE-R) 73.5 CC, combustion chamber and canted valve ...
The Mustang's engine compartment was not wide enough to accommodate the massive Boss 429 engine, so Ford contracted with Kar Kraft of Dearborn, Michigan, to modify 4-speed Cobra Jet Mustangs to accept it. Kar Kraft was a Ford exclusive experimental facility that functioned as Vehicle Engineering for Ford's Special Vehicles.
The top option was the 429 SCJ (Super Cobra Jet), rated at 375 hp (280 kW), and was part of the "Drag Pack" option. Selecting the "Drag Pack" option turned a 429 CJ into a 429 SCJ. The drag pack required either the 3.91:1 or the 4.30:1 axle ratio, and included a 4-bolt main engine block, forged pistons, 780 CFM Holley carburetor, engine oil ...
The 428 Cobra Jet was a performance version of the 428 FE. Launched in April 1968, it was built on a regular production line using a variety of cylinder heads [30] combined with a 735 CFM Holley four-barrel carburetor. The Cobra Jet used heavier connecting rods with a 13/32 rod bolt and a nodular iron crankshaft casting #1UB.
Knudsen was also credited (and heavily criticized) for ordering the design of a larger Ford Mustang from a sporty compact ponycar to a heavier and almost-intermediate sized car for 1971, with much of the enlargement reported to be necessary in order to fit Ford's large 429 cubic-inch Cobra Jet V8 under its hood without extensive modifications ...
If a V or W axle was ordered (3.90 or 4.30 locking ratio) on any Cobra Jet Mustang, engine improvements were added to make it more reliable on the strip. Included was an engine oil cooler (making AC not available as an option), stronger crankshaft and conrods, improved engine balancing, and was named the 'Super Cobra Jet'.