I have the 8007 on the 318. They list it for the 318, 340 & 360. Range: Idle-6K. This is their only Action Plus for a SB.
There is a 8022 Stealth also listed for the 318. 340 & 360. Range: Idle-6800. Both are dual plane manifolds. Perhaps the Stealth is what you are referring to as having the 340/360 port.
Any desirable intake should be worth at least 60-70 percent of what it sells for new.
120-140 bucks?? If I wanted it I would be willing to pay at least that for it.