You never said what the application is and I see that no one asked. That should be first concern.
By the pics you supplied it looks to be a car used in Brackets? If so that is a killer scoop design that originated in Can-Am style racing and has sucessfully been used in class racing and does makepower.
The ones you posted pics of at first are essentially a no-brainer opening for a carb to sit under that complies with rules and people buy them.
Ed