There is an NOS shroud on eBay for $150+$10.
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The S10 column will be a good source for all the parts you need, if you can get it for a good price. The S10 shroud will be shorter, but see if you can get pictures of the column and a length measurement of the shroud. Then, see how it compares to yours.
You can measure from the bracket that bolts to the dash to the bottom of your shroud for a relative idea of where the end of the S10 shroud will be. Then, you can take that measurement to the car and measure from the studs that the bracket mounts to and see how it will look on the car.
It was good to go through the carburetor. The accelerator pumps were also likely bad. In 1980, I bought a new 650 double pumper, List 4777. I remember it having 68 primary jets and 72 secondary jets. The larger the jet size number, the larger the diameter, so more fuel will flow through it. If they are too big, it will run rich.