Joe,

Yeah, I checked the rails (they seem to catch everything, don't they?).

I agree, the cleaner is for at least a 2bbl, and it doesn't look like the adapter was a GM product.

I cannot find a stock cleaner for the 1bbl (other than oil filled).

What was stock on the '66 250? I'm stumped.

Rick in San Diego (...er, Jackson)
'66 Fleetside
Ol' Car Guys

"I was born in the back seat of a Yellow Cab in a hospital loading zone and with the meter still running. I emerged needing a shave and shouted 'Times Square, and step on it!'" - Tom Waits