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What RPM timing be set at on 350 Chevy 1974 engine?

Base (initial) timing:

- Manual transmission: 6° BTDC

- Automatic transmission: 4° BTDC

Centrifugal advance:

- Begin: 1,000-1,200 RPM

- Maximum: 24°-34° @ 3,000-4,000 RPM

Vacuum advance:

- Begin: 4-6 inHg

- Maximum: 10°-14° @ 10-15 inHg