Upgraded 273 commando intake manifold suggestion

What year? If 66 and up go with LD4B. If earlier the original heads have different mating angle to the intake(D4B) and bolt sizes.
1965 block that was upgraded by a previous owner for you and a Dodge dart on the track. He put 340 heads on that little engine and it didn’t Run well for him so he put the engine in storage and I got it for 300 bucks and now I’m making whole again to put in my Barracuda