I just put a kit in my old AVS as it had a bad off the line bog due to a very late pump shot that could not be adjusted out. The kit had the proper leather pump, but no matter what, I cannot get the pump shot to come in immediately. I have overhauled over 100 carbs in my life and never had a problem like this. I am beginning to think that the ethanol is affecting the pumps ability to seal well. I am going to try the edelbrock pump as I have had no problems with them working in later AFB's.