[gag1025]

Bad Apache. I actually have a 80670 carb. I wrote down the wrong information in the beginning. Actually if I had the 80570 carb it may not have the same issue. To answer your questions it has a Holley electric fuel pump. This is the Holley Avenger 80670 series carb. It is a stock Chevy distributor. The engine is a 4 bolt main 350. It cranks fine, idles fine and is OK until I hit a steady speed (say 45 mph) and all of a sudden it stumbles and when I accelerate it smooths out fine. The problem only occurs when I hold it at a steady speed. By the time I drive it up the road it has heated up so I have no way of knowing how it reacts when it is cold.