D4B DC mods like the LD340 DC mods?

Would it seem logical that what's good for the LD340 is good for the D48 or LD4B in regards to the Direct Connection plenum mods? I don't know the exact spec but I'm talking about the square notch.

For those that care: 1965 273 2-bbl. Changing to dual point distributor, D4B, Carter AVS 4638SA (1969 340 auto), Commando type cam grind. I will probably keep the 9:1 (?) pistons for now but if it gets opened up you know the 10.5 pistons will go in.

So, from a flow and distribution aspect is what is good for the goose also good for the gander?