Davey,
Checked with Mike and it's a 90 degree fitting that you need. A 1/8" male to female and they can be bought anywhere that Weatherhead fittings are sold. Napa or your local parts warehouse should have them for a few dollars. Heartbeat shows this one on their eBay listing so here's a pic showing the 90 fitting in front of the stock fitting. Good idea to add a piece of Teflon after the first thread before putting the 90 in the block so it doesn't sweat. And be sure to put them in the block prior to the intake going on as they can be a PITA to try and do after since the intake overhangs the back of the block. I did one years ago after the motor was installed and there's like zero room to maneuver if you forget to do it before the engine is installed in the car.
