Try retarding the timing a degree at a time until the "chatter" goes away. With the modifications which you have made, the "Book" no longer is relevant. Now it is the "seat of the pants" adjustments which matter.
Carl

Last edited by 52Carl; 09/23/2014 12:59 AM.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission