A tall rectangular plenum runner entry is more difficult to improve with a radius, bell mouth etc. (which should extend above the floor for maximum CFM).
There is also a theory that the plenum cross-sectional area just inside the TB air entry should be considerably larger than the area after the last cylinders (linear taper or exponential? IDK), and the plenum should extend significantly beyond them (at least 1 entry diameter).
It appears from the pictures that your runner angle is more horizontal than your port centerline. IIRC unless you know better, closer alignment is preferred, but that may require a "horseshoe" runner (as seen in cross section across the valley) with curved legs.