Usable power for the street?

I'll take all the power I can and use it according. Just because you have 5 or 600 hp doesn't mean you need to drive like an idiot, I've seen plenty of low hp cars do that and get themselves into trouble. As far as fuel mileage goes if I'm in my big block car I don't worry about it other than I don't want to run out. My Plymouth gets about 3mpg on e85. and my sbf does 15 on the highway and can run mid 11s. Before I retired I would drive both cars to work, 25 to 40 miles total. You just need to decide what you want from your car and build it, for me the drive is more important than the cost of it.

^^^^^ This ^^^^^

I've had my street/strip Dart for almost 17 years, three engines over that time. with the 340 it ran 7.24 (1/8), the 408 ran 6.57 and the 434 has ran 6.25, all three ran on pump 93. The current 434 made 543hp at the wheels, yes, if you get stupid it will too.

To the OP, build as much power as you want and how you want to build it, regardless of what I or anyone else on the internet says.