Ola Double check your engine options again. Power would be more like 361 - 383 - 413. The 426 wedge (and later to be the 426 Hemi) was a Dodge or Plymouth engine. In either form the 426 was never a Chrysler or Imperial engine. But you could get a 361 with 2 bbl carb and single exhaust in all Chrysler's, Dodge's or Plymouth's. Or,...at one time a 361 with cross ram'd manifolds and dual exhaust in your Plymouth. And while I'm on a roll...what was the De Soto Adventure top engine option for 1960 ??? And in the mean time Imperials just cept on using 413's. Rodger & Gabby ps The Adventure was De Soto's answer to Chrysler's 300