I think the Edelbrock LD4B and the Weiand Stealth are the same thing...

The LD4B is made for the 318 sized ports. I have an unmodified LD4B in the shop as well as an unmodified 1972 340 intake. The ports on the LD4B are shorter and fatter than the 340. The LD4B will probably flow about the same as the 340 intake, but if you want the ports to match up, you need to run whichever intake matches your heads.