273 to 383 Formula S Barracuda
the original 273 S car with a correct 273 is going to be valued higher than a motor swapped car. if that's your end goal, that is.
but if you're building it just for you? damn the torpedoes, then.
i'd say the easiest way to do a 383 with power steering would be an aftermarket front suspension (HDK, AlterK, QA1) with a rack & pinion.