Intake Choice for 400/512 Stroker

I replaced my M1 with Eddy Victor 383. Very little change. (Was really more for cosmetic.)

Although I found the Victor to make carburetor a little more finicky. So a little more fine tuning. Which in turn appears to have slightly better performance. The Victor has a better "Line of sight" runners to the valves than M1. Which to me? Makes sense that it would then make tune more sensitive. Is the slight increase in performance due to better intake design? Or better carburetor tuning? That I'm unsure.

Just sharing observation of a moderately high performance 451 stroker build.