Good tip, as always, on the filter.
The outlet on the cell is right above the rack for the steering, so the back of the tank is as low as Jimmy can get it and still have it caged in. It has 3/4" of clearance off the frame head, and an inch and a half off the tunnel while it's sitting at that angle.
In the first picture, you can see one of the outlets on the tank. The fire bottle is in the way of the other. What'cha can't see clearly is the growth off the center of the bottom rear that lets me set it at that crazy angle and still take advantage of most of the fuel. It's at a pretty odd angle if the tank's sitting flat, but it's almost horizontal at this angle in the car.
There's barely enough room to close the front end without going with a smaller tank (this one's 12 gallons) or crowding the steering by sliding it back a half-inch further. If you look at the cell in the second picture, over Jim's left shoulder, there's a better view of the bottom of the tank so you can see its contoured surface.
He's already planning on running a 90-degree turn off the backside to clear the first "U" joint in the steering shaft, so placing your brass "sock" there should be pretty easy. Thanks for the idea.
I'll try to take a better photo as it gets closer to being finalized.
Keep checking back, sis vous plait, 'cuz I'm determined to be done welding by noon Thursday.