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The 392 production motor is already around 500 hp. What would be so hard to make a 426 or 440 stroker make 700 hp? The Apache heads flow great out of the box. Cubes, compression, cam...stir it up, add some race fuel.



The only potential obstacle to reaching 700 h.p. in either case would be the hydraulic cam.......I am assuming we are talking N/A.
Probably easier with the Hemi I think , so if you can cash out of the parts you already have , it makes sense.