If you are using a digital meter you will see some jumping around on the dwell.
On the other hand...
If the dwell and timing are moving around on you it could be weak mechanical advance springs, a worn breaker plate, a worn vacuum advance, worn shaft bushings or a worn distributor gear. It couls also be a bad timing chain.
Good luck
John
[ June 26, 2005: Message edited by: jdorour ]</p>
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1966 Ninety Eight Convertible - 425 Tri-Carb, Factory Dual Exh, Switch-Pitch THM400, 3.54 Posi.
1966 Catalina Wagon - 421 Tri-Power, M21, 4.11 Saf-T-Trac, 8 Bolt Wheels
1989 IROC-Z - 5.7TPI
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