There is so much 'lore' and antidotal evidence about oils and an oil thread is always interesting, so I thought I'd post this here.
If you want to know more about oil than you ever cared, follow this guy on youtube.
https://youtube.com/watch?v=erxjPicpYyw

The radiator mount is to the u channel. The u channel mounts to the engine. (2 brackets, BB & RR in the drawing) The engine, trans and radiator remove as a single unit.

I'd just cut out a piece of sheet metal, fit it tightly and tack it in in 4 places to mimic the original punch out.

Physical winch is the same. The mounting brackets may not be. There are 4 brackets. 2 large ones on the sides and 2 small ones on the front.

Have one made at a Parker Hose store

Yep, it's usually something easy like that.
Glad you got it fixed. (Without the electric fuel pump, electronic ignition crowd spending your money needlessly!)

Welcome, Jim
Always a bigger challenge when you didn't get to take it apart! Get quality copies ALL of the military manuals, including the 3 parts manuals, for the truck. The pictures and descriptions are invaluable to determining what goes where.

It is most pronounced when fully closed.

So, what you don't know is if the choke plate is in the intake tract and if it moves. But you are "lucky" that someone drilled an extra hole in the airhorn of the carb and plugged it with a bolt. You might be able to remove that and see if the choke is closing. The actual bowl vent is alon...

Does the choke actually work? Choking it will draw the fuel from the bowl quickly. If the choke plate isn't closing you will not get the pressure differential you need to get the fuel to flow . And I just keyed off of you saying that you dribble fuel into the main vent tube. You are NOT running an E...

As much as I hate spending money, I'd recommend M-series Rebuild's unit. Even though it isn't a drop in and is expensive. The others don't do anything to address the stress they add to the frame where the box mounts. Cracking has been often reported. Personally, exercise is cheaper. I run stock stee...

When it's warm, don't pull the choke out all the way. Close it quickly while cranking. All you want to do is pull a short slug of fuel to make up for no accelerator pump. If you flood it, choke in, throttle to the floor and crank. It will clear and start with a pleasant cloud of black smoke and soun...

Then you need to work on your starting procedure. Switch on Throttle pulled out a few notches Choke pulled out Step on starter and push choke in while cranking. Start every time hot or cold. (The accelerator pump is vacuum operated. Pumping the pedal does nothing when the engine isn't running. You n...

Carburetor. That is the only place it can "lose" prime.

Headlights are for driving.
Parking lights are for parking.
It's only modern era where they both are on at the same time. (1970's)