hey i have a problem i own a 1965 ford f-100 current motor is a 352 which i read came with 300 hp with a 4barrel carb but i have on my hand s a 460 dated around 1975 or 1976 which means the hp ranges from around 208-275 hp my question is are my numbers on the 352 correct does this motor come stock with 300hp with a 4 bar. second pre 1973 460 came stock with 375hp why such a drop from 1973 to 1975 was it due to the smog control? need help cant figure out what motor to go with please help!!!!