Thanks for the advice.
I did go ahead and drain the gas tank - in the process, the flexible fuel line between the manual gas valve and the hard line disintegrated - probably a good thing it happened really, when I could see it, although created a mad scramble to get a new one!
Continued to drain the tank completely and managed to dispose of the old gas at my City Hazardous Waste center for no charge.
I had an inline filter right before the carb, so replaced that at same time and cleaned out the carburetor (which per the manual appears not to be the original, which should be the GM Model 'B' on a 51, but is in fact a Carter Downdraft)
Got the Fuel Line this morning, bolted it in and cranked her up - took a fair bit of cranking till the gas got all the way up there, but eventually kicked in - and NOW REVS FREELY!
Then onto the next problem - the radiator was leaking - quite profusely! I'll look at a permanent repair after the move, but a bottle of K-Seal took care of it - after running for about 15 mins, the radiator was tight!
Mini 'road' test tomorrow (just down the street and back) - I need to be able to get it on the Transporter so ideally it will move and stop appropriately!
The brake pedal is still solid and the brakes grabbed when just pushing it down slight incline (although the front rotors are covered in surface rust) so I think it will be OK
And I did get the clutch to lift and engaged first gear, and while holding the brake as I was easing out the clutch, it clearly loaded up although I stopped short of actually fully engaging the clutch; but I believe it will actually move on its own steam (sic)
On to Tomorrow!


'51 Chevy 3100 Truck - OEM 216 Engine; three speed column shift transmission
6 Bolt disc conversion with dual master/vacuum booster
12V alternator conversion.
235 engine in waiting grin