My 440 Build. Which intake and WHY ?

I’m going to assume your car has the factory hood. How are you installing the engine? Conversion mounts? I ask because different adapter mounts may position the engine slightly higher or lower in the bay. I installed a 440 in my Demon. Factory flat hood. The Performer RPM is a very snug fit due to additional height at the carburetor mount flange, think hood clearance. I ended up using a 1.75” (iirc) drop base air cleaner. Along with that drop base comes other issues, the way the fuel line routes, linkage issues going to carburetor etc, due to clearances. I used a Direct Connection K-frame, which is a spool engine mount. This gave me some lee way on the positioning of the engine. I have never run the Performer intake so I can not help you out there. The advantage of the Performer is I believe it’s modeled off the factory intake but saves you weight, it’s about stock height. I personally feel the Performer RPM is a good all around intake, but there are other issues that come with the height that have to be worked out. For your usage I do believe most people will recommend the dual plane manifolds. Someone with more experience will roll along and add more info for you. My engine set up is 10:1, edelbrock rpm heads, lunati 237 int, 243 exh @.050 .566 int .577 exh solid roller running a 3:54 rear with 28” tire. I have run two passes at the track best time 12:78 (car has more but I need to work with it more) but the thing is I can cruise the interstate and flow with traffic with no issues (70-80mph). I know it’s not a direct answer for you but just giving you my experiences.