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I am totally frustrated with my 68 convertible. The engine starts fine and while cold runs smooth. Once warmed up I can't get it to run right. It sputters and misses and I have to keep pumping the gas to get it to run down the road. I've replaced the carb, coil, points, fuel pump, fuel filters, and still the same problem. I checked the timing and its at 6 BTDC.
6? Seriously? Set it to 10-12 at least. And has the carb been tuned at all? Pulled any plugs? What do they look like? Reset the timing and see what it does, if it still runs like crap post pics of the plugs.
Sounds like a choke problem, but if he replaced the carb, maybe not... have you ever replaced the vacuum advance on the dizzy? get the timing right too, like said above.
4 degrees of timing isn't going to make that big of a difference. Sounds like old plug wires. A little more info would be nice though. When does it miss and sputter? Do you see any smoke?