When the engine is warm (30+ minutes on I-10) and I need to accelerate heavily (ie floor it) the car stutters.  My first thought was that it wasn’t getting enough air.  John Twist looked at it at the GOF and didn’t see an issue.  Any ideas?  Wondering if vapor lock or overheating of carb bowls could be a cause.  I have Webber carbs and rubber fuel lines.

Thanks for any ideas you have.