The cobrajet and supercj heads are the same except valve material and srings. The super was a solid cam. The reg 429 head and 460 head are sim. The very early 460 has a diff deck ht. set up. All heads interchange but the jet castings have much bigger ports and dont look like any of 460 iron heads. The jets had Rochester Q/J carbs in torinos. Not alot of em around either-mainly cobra models. A good running 429 jet is a solid 375 hp engine, the supers more. A blue thunder -jet dual plane intake and an 850 holley style carb will wake it up serious if it's a jet.