I have a 1952 Buick Special with a 263 and I am having trouble getting it started. It hasn't ran in about 3 years. I have replaced the fuel lines and filters. Lines and pump are full and pumping. Fresh gas. I have replaced the points with a Pertronix electronic ignition and have good spark. It cranks pretty good for an old 6v but it just doesn't seem to want to fire. I'm not a mechanic and could use some advice. Does anyone have any suggestions to get her started?