Hi Chris, In the 1978 issue, volume V, number 2 of the club newsletter there is a reprint of "Chrysler Confidential Technical Bulletin # 364" dated July 18, 1957. The bulletin starts off - "We have received reports of poor idle quality, stumble or hesitation on acceleration, stalling on stops or sudden turns on some Chrysler 300C. Considerable improvement of warm engine performance can be obtained by following the service correction below:" There are 8 steps to be followed along with diagrams for drilling holes in your carburetor. I don't have the actual tech bulletin - just the newsletter article. Listserver will not support attachments, so I can try scanning this info into a jpeg and send it to you. And I can also send it to the tech articles part of our club web page so everyone can read it. Or perhaps our wonderful Electronic Committee has the article and is able to post it. Gloria Moon