Timing jumps between 18 to 20 BTDC at idle after warm up. The RPMs change very slightly ( but do change) when adjusting the four corner idle screws but the only tach I have is the one on the hood so I go by the sound difference. I do have two vacuum gauges and both fluctuate consistently between 12 and 13 inches. The most noticeable difference comes when I adjust the four corner idling as reflected on the vacuum gauges with vacuum starting out at 10 inches before idle adjusting and ending with the 12-13 after I fattened up ( enriched) the settings.
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