This isn't me changing my point of view but in that question they all won't make the same power, take the two extremes displacements 273 vs 408 at the same piston speed of 4000 fpm, so 273 would be at 7250 rpm and a 408 would at 6000 rpm.
Could build for higher piston speeds but ratios will be the same between the two engines. So a 273 would displace 573 cfm of air at 7250 rpm at 100% VE and a 408 would displace 708 cfm. When taking things to the max, smaller bore can't spin high enough over come the larger bore but compare a .030 over 360, so 365 at 4000 fpm would be at 6704 rpm and would displace 708 cfm's on pare with the 408. At that point now you would have to argue fictional hp loss rod ratio benefits etc..
