The guy wants to make the trade after the summer. This suits me perfectly 'cause then I have a chance to try my car. I might even be able to borrow the AirGap to try it out.
The main thing for me was the magnum heads he has. The intake swap came later, by chance.
I would hang on to the LD4B. They are hard to find. I have found more LD340's than the LD4B over the years. They are great to wake up a stock 273/318/360.
You can buy a new AirGap, but not the LD340 or LD4B....