Advance springs are under the distributor plate w/weights etc. sounds like your mechanic checked them. I'd still rotate the rotor now and see if it still has some "snap back"? I don't have an alternative plug since I use the same Champion RJ12 plug. Used to use the std recommended and common J8C in early years without any dramatic designable differences.
I hope the carb replacement works for you but I think you'll find the expert folks on this site and past threads generally advocate for more of a diagnostic approach - vac pressure, fuel pressure, spark color , coil readings, voltages etc etc. rather than opting to changing out expensive components [except for cap/rotor/wires] I say this because I still use my original zenith carb from 1966 on a good running A4. Still, experience can sometimes quickly point to the problem. good luck.
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