Stroker specific cams?
IMHO.... A lot of what is being missed here is that you are going to use EFI. One key on the cam used for that 351W EFI build is that the LSA is wide... in the 112-114 range.... to keep the MAP sensor stable at the lower RPMs for stability in the EFI system. The lobe shape has little to do with that, so don't get hung up on ideas about the XFI lobe being particular in that regard.
Your desire to not give away a broad performance envelope will drive you smaller durations, not larger ones. Your car driving description wants a very broad torque curve that reaches well down towards 2K RPM, and puts much less emphasis on peak HP. (But you will get good power from your breathing parts on your engine anyway. 'Drag race' grinds are not what you want.
The duration spread has more to do with the valves and ports in the engine and little to do with RPM range or being EFI or carb.