Check/adjust point dwell first, then, check timing at idle. Should be 2-3* BTDC. Original distributor should be #1111055. If the distributor is not original, check and set the total timing to 32*. https://www.v8buick.com/index.php?threads/power-timing-your-buick-v8.63475/
Your a genies! my guy just came in and told me he hadn't set the dwell and when he did it settled down and is fine now. thanks i really appreciate the advise!