I say somewhere in the 550 HP range with adequete carburation since you didnt mention the size of carb you'll be using.
It would be a good idea to run a main stud guirdle, 302's and 351W's are notrious for splitting right down the middle of the block when you start making some serious power.
Dam Dirka you didnt know fram filters were garbage? Must we teach you everything? J/K>LOL
Goodluck, Cp