I have a 1955 with the 292. What are the current spark plugs you are using?
My plugs are the RFI4YC and they are really carboned up from my carbonator needing rebuilt. I have rebuilt it and am doing the plugs now.
I had purchased a FIXD device and ran it the first day that I got ot and all was fine. I have installed a new radio and so I had disconnected the battery while doing so. I then got NGK BKR5EGP plugs from a posting on this site with amazon. After painstakingly removing the spark plug covers...