A small advantage is an advatage, not to mention the air gap function and the looks of it.
3/10ths is HUGE! I learned this early on with my first dodge dart when I switched to a holley, easy to tune, easy to get parts and without a doubt offers more performance as you have proven for yourself.
This is what I was talking about. Also the blockoff is a no brainer for a performance oriented car. It's fine to far below 60 degrees.