For one season I ran with HD8 carbs. These made a great difference due to the 33% greater inlet area when compared to the 1.75" Strombergs. They were removed to make way for a Lucas PI system that I imported from England.
Previous setup with dual HD8 (2 inch) carburetors. Accusump is in upper right hand corner. The Accusump accumulates oil under pressure and releases the oil when starting the car.
I preferred the 2" HD8s over the 1.75" ZS. That 1/4" actually increases inlet area by 30%.