Is This Enough Fuel?

I'm just trying to sort some poor running/performance issues. My engine starts and runs, but not really running great. I did a fuel volume test. My engine is a 383 with a mechanical fuel pump and 5/16" fuel line. This is the amount of fuel pumped while idling for 20 seconds. I think this is around 250-300ml of fuel.
Should there be more or does this look about right?

View attachment 317790
Author: Wildaugust