318 power?

I'd tend to say the 459 but I'm assuming there's some gotcha coming.

I have a 400 block myself, waiting for a proper stroker project.
It wasn't meant to be a gotcha, it's should of been I see there's some faults in the logic in my statement and we went on with our days :) Instead it seam's like you answered a question that wasn't asked or you're just wrong.

Since there tons of variables you got take things to the max, there's two main limits piston speed and valve size, Mean Piston Speed (fpm)=(Stroke x 2 x RPM)/12 say 5000 fpm for both.
So 3.38 = 8,876 rpm and 4.5 = 6,667 rpm, rpm is displacement over time and air is what's being displaced we measure that in cfm 459 x 6667 = 885 cfm, 400 x 8,876 = 1027 cfm that's 16% more air & fuel so 16% more potential energy. 2nd is valves which port size air flow etc...

So can you build 500-600 hp with the 459 sure will it be more street friendly then a 400 again sure. So it's more like is the displacement a good match to the power I want and where in the rpms I want it, sure it doesn't roll off the tongue.