Trade '71 340 intake even for LD318 or street friendly 318 intake

No such thing as an "LD318"...I think you mean "LD4B"?...thats the small port Eddy aluminum intake. There's a guy in another thread that has a "SP2P-318" for sale. Those are good street low RPM/mileage intakes for the small-port head engines.
Yeah, thank you for correcting my stupidity:violent1:. Even a P2P would be nice, but I'm unsure how it would do with a 650 Edelbrock.