340 head, intake advice please

Run what you got. If you have the time, equipment and skill set to open up the port window on the 318/360 performer intake, it will help a little. IMO, for a driver deal, it's not worth the time or effort.

That performer intake with a 1" open spacer works well on warmed up stuff. Open the port window/spacer and it's dang close to an Air Gap/RPM intake.

Weiand stealth and action plus have a small window and people say they are OK on a 340/360 head.