A 68' VARY hard starting 427. I have to pump the throttles 60 to 80 times before the engine will even try to hit (pump throttle 10 times, crank engine..., repeat sequence 6 to 10 times). Once the engine starts and warms up, it will run all day. I can turn it off for the day at anchor and it starts right back up with no hesitations. Let it sit for a couple of days, and I have to go back thought this long drown out process again. I am beginning to suspect a problem with the auto choke or the carb its self. This carb has been rebuilt twice in the last 5 years.