Don't likely use an LD340 in testing as it's not available new. The Mags are about selling product for manufactures.
The Performer 318/360 is a solid intake with about 5 minutes per port and a grinder. Run it and a 1" spacer and it runs VERY close to an RPM/LD340 intake. BTDT. If you have the intake, it's capable with a little elbow grease.
The port opening is a non event with these intakes between the LD4b, LD340, RPM and air gap.
