Add hotter cam or Add hotter head ?

How many 400 horse 360s out there that run like **** down grandpappys pant leg after the sunday chili potluck .
Quite a few. You could take a motor that makes 300 400 whatever horsepower and stick it in a car with the wrong gears and converter ,manifold and the rest.. and have as much go from a dead stop than a well tuned 64'-65' 225 valiant