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Timing should always be set without vacuum hooked up. Initial timing should be around 12-15 BTDC at idle - around 24-26 BTDC at 3000 RPM's - and around 36-38 BTDC at 3000 RPM's with vacuum hooked up. There's (3) stages to timing on sbc:

10 degrees initial

10 degrees mechanical advance (the weighted springs in the distributor)

10 degrees vacuum advance These will vary depending on carb/intake/cam setups. Hope this helps!
The lower the compression, the more timing you'll need. Could be up to 18 degrees at idle (42 degrees total.) I'd start at 38 degrees total and go up and down a little at a time until you find the best performance.

That cam likes compression. The more the merrier. At least 10:1.

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Q: How many degrees advance should you be set on sbc 350 with Vortec heads HEI distributor Edlebrock Performer manifold 488 lift 292 duration cam and should the timing be set without the vacuum advance?
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