BBC jets

I took a closer look at the carb tab-the number is 4947 which doesn't show on the chart for a '71. There are no numbers on the jets but a .041 drill fits which is the smallest jet for this carb. The metering rod measures .013 /.005, which doesn't match any of your rod sizes.

Another thing also, I noticed that there is only a tiny amount of fuel in the bowl. I filled the bowl with thinner to see if any plugs might be leaking but can't see anything.