Please don't convert to Weber downdraft... BIG performance drop compared to D-jet that's working right, particularly on a '71 motor.
Sounds like fuel supply problems to me. There's a "sock" filter inside the gas tank that can plug up as well as the external filter. Have your mechanic check fuel pressure while he drives the car (duct tape the gauge to the windshield, if nothing else) and see if it doesn't drop as you go.
Once the car sits for a while, enough fuel seeps through the plugged filter for the car to start and drive a few feet. That's my theory, anyway.
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