Removable top so you can work the insides and choose whatever carburetor style and coolant crossover already separated.
According to their website as cast is $715 with crossover for either style, port matching from 290 cfm through 400 cfm at $75 up to $200. Quite reasonable actually.
Game changer.
About time someone stepped up and brought something like this to market.
No surprise that the Kaufmans made this happen.