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Depends on what it takes to get it started. I am assuming you have a 4100 Autolite carb. If so, you may have an oozing or drippy power valve. Easy to replace and available without having to spring for a kit. If you have an Edelbrock or an older Carter AFB the power circuit has mechanical metering rods so this does not apply. IF you have a Holley the power valve idea is back in play. Does it fire at all when this happens? Can putting your foot to the floor (or maybe 1/2 to 3/4 down)?. This would be flooding and the carb is the issue. If there is no fire whatsoever then you think spark. More questions....does it still have points or is it a Pertronics conversion (if it is points you owe it to yourself to buy the electronic ignition kit...cheap and easy to install) If it still cranks hard and slow during this time your system voltage could be dropping low enough to screw up your spark. Battery, cables and/or starter possible causes not to mention the timing issue we talked about earlier. No on the filter for sure since it runs ok under higher fuel delivery and no on pump unless it fires and dies as the carb bowl runs dry. Hope this helps.
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