35 years or so ago I opened an Impala's hood to check the oil and found a 454 under there with a 2-barrel rochester on top. I believe those were like 450 or 500 cfm.
So be generous & call it 70 CFM per liter.
If it had a quadrajet it would be 650 or so but might have got as much as 800 cfm. So, 100-ish cfm per liter, max.
Weber 40s flow a little more than 200 cfm. In a 2.3 liter engine that's 92 cfm per liter.
The 44s are close to 300 cfm. That's 130 per liter.