Ha ha!
It's the simple things.
A while ago I bought a few feet of the two smaller sizes of silicone tubing from Texas Timers. Glad I did, they are so handy in all kinds of situations. In this case the needle valve is not much over 1/16" diameter, so I sleeved the threads up with a short piece of the smallest stuff, then the next size up goes over the spraybar and NV for an airtight seal. I blew through the fuel line and opened the needle until I got a "that sounds about right" hiss, and clamped it up to the flight box. Fueled it up, finger over the vent, filled the fuel line and a drop in the intake, light prime.. and no word of a lie, first flip it took off backwards, so I stopped it by hand (ahem), then flipped forward - bingo. Took right off, 4 cycling but steady, so I brought it up to a fast 4c, pulled the glow clip, and it ran off a tank without a hitch.
So the Sniffer has a powerplant.