By all means, check the advance curve, because you need to know if the distributor needs cleaning or other work.
Most likely, though, is that your main jets are clogged because of debris in the fuel ... because under load your engine operates on the idle jet circuit up to past 3500 rpm under load! I recommend removing, disassembling and cleaning the carbs with a vat-type carb. cleaner such as Berryman's Chem-Dip.
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Warren Hall, Jr.
1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
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