Suddenly won't start

I have a '73 convertible with the 190 hp 350 in it. Have owned it a year now and has always been easy to start. Usually turn it over briefly without giving it any gas, then shut the key back off, pump the accelerator once and when I turn it over again it fires right up. A couple weeks ago after refueling I left the gas cap sitting on the gas pump at a convenience store. I started the car at the pump then drove it about 50 feet away and parked to go into the store. When I came back out, it started normally and I drove 8 miles to the house and parked it in the garage. Later that afternoon I couldn't get it to start -turns over but won't fire up. That night I was laying in bed and it hit me that I may have left the gas cap off, so I got up and went to look at it in the garage -sure enough it was missing the gas cap. On my way to work the next morning I went by the store and the cap was still sitting where I had left it. That evening I put it back on the car, but it didn't cure the no start problem. Don't know if driving it without the cap on is the cause of my problem or just a weird coincidence. Any suggestions on what the no start problem might be and what I can do to fix it would be greatly appreciated. Thanks.

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