The intakes are separated side to side but there is a small window to offer a passage between the two sides of the intake, under the throttle linkage boss I think
Years ago Diamond Elkins would cut the tops off the cross ram intakes, both Hemi and wedge manifolds, and open up that passage and maybe enlarge the intake port openings a little bit and weld them back together, that was said to be at one of the old Mopar drag race seminars back before 1980
I may convince my customer with his cut up manifold to try the four hole inserts maybe not