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Correct spark advance settings ??

Hello everyone
Need some help again !?!
What is the correct spark advance setting for a stock 71-72 351C
Is it somewhere between 6-10� at 800rpm like many other V8 engine ?
Or like 16� at 1000rpm like a 76 GTS according to a book a friend's has ???
Should I disconnect vaccum advance / vacuum retard ??
Thanks in advance for letting me know
Thierry
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