its one of the few designs ford copyed from chevy that worked. if you take off the distributor & valve covers you can't hardly tell them apart. I have been looking to build a Boss 429 one day(Hemi), but the time and money are never in the right place.
by the way, did you ever notice the notches in the shock towers on your 73? they were for the 429 Boss, but it was never put in on any production vehicle.