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18 shouldn't do that with the B303 cam. It's a nice cam, but hardly "radical". 12 to 14 is normal, 18 is to much. Are you still using the stock computer? If so you have to unplug a wire connection right near the distributor before you set the base timing. Other wise the computer will fool you as to the TRUE base timing.
If not computerized, I'd check for TDC mechanically (valves and piston position) and compare that to the harmonic balancer which could have slipped and is now showing a false Top Dead Center.
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