Many says the horsepower dropped alot in 73, but they changed the SAE GROSS to SAE NET 1972 and thats a big difference, would a 266 HP 351c 4v 1973 make around 300 if in GROSS ratings then...
Notice that in 72 Ford started with net hp ratings; and between 72 and 73, the 351C 2V went from 8.6:1...