I like the list 273 put up for street engines. Not that more HP isn’t doable or becoming to rowdy. They are good ranges to use without getting very large with the camshaft, which can be undesirable.
The best plan for power, no matter the displacement would be to use the best head (and intake) you can afford up top followed by a exhaust system to suite. This can be varied and dependent on the type of car being built. For a street car, I really like how D. Vizard thoughts work on this subject.
