Does this Holley have the inline filters in the bowl inlet? The porus brass style? May want to check them and see if they are plugged. Also, the float may be sticking partially shut and preventing fuel to flow propperly into the bowl. I suppose you could be getting a vapor lock; but, I really doubt it, especially if it is running bad right from the start. I would really find it hard to believe that the fuel would be heating up fast enough to do that.