LD340 manifold vs RPM Air Gap

The RPM AG will show gains over the LD. But at it's current price tag, I'll modify a LD as per MoPars instructions and add a spacer for the extra plenum.

IMO, *I think* you'll loose a little low speed torque and not get the same top end power, but it'll be a good intake. A 2 hole spacer (A oval on each side) is what I would use. (If need be)