Well, I believe that I have a 56 235 in my 37 truck. The serial # is xxxxxx F 56 Z. Anyway, I unloaded it from the trailer, started it and it died. After advice from this site, I changed the plugs, points, condensor, checked the valves to make sure they aren't sticking and made sure the float wasn't sticking. The cap, rotor and wires are all good. I ran the #1 cylinder to the top, checked the timing mark thru the window near the starter and made sure the rotor was pointing to the #1 plug wire. I have strong spark on the coil wire and have spark at the plugs. Now it still won't start. It keeps backfiring thru the carb like the timing is still off. I even poured gas into the carb and it still didn't fire. This is such a simple system, I am stumped. Any suggestions?