Small block EFI intake manifolds (Mopar, Holley Street Dominator, Edelbrock)

Dual plane, assuming ld340 but it's not cast into it. It is an old piece, converted in the 90's and ran as a carb years before.
Not sure on mopar, was there an m1 dual plane for sb?
Yes, they made the m1 in both single and dual plane. Are they both 340/360 size ports?