Thank you for your reply and help. We changed to a 12 volt system on my sons 50 ford 2dr coupe and it ran great. This conversion was a little more complicated because the previous owner had rewired things, put in an electric fuel pump etc. and it took us a little while to figure it out because we could not always use the wiring diagram from the vendor. We changed the starter solenoid, coils, condensers, battery, 12 volt ground and had to change the fuel pump to a 12 volt one. (I might go back to a rebuilt standard model). I checked the spark and it looks good (running well) but will recheck. Perhaps it might be the vacuum advance, dwell, or points? Will start checking those. The way it jerks, it either has no power or the brakes/clutch are locked.
Our 50 ford was baby blue, so Iove the color of your 53.
Thanks
robert