I have a '68 bird with 250 OHC, in-line 6, single barrel carb. I also have what seem like a 2-3 second delay from when the time I mash the gas to when the car responds. I recently had a reputable carb shop rebuild my carburetor and really dont think that is the issue. Someone suggested replacing the fuel pump. I can't find an exact one anywhere for this eng & carb. I tried all major restoration catalogs and parts stores. Anyone know where I can find an exact match or suitable replacement? Any help or suggestions are greatly appreciated.