beauti,
If it were my truck I would install a manual choke.
Pull the choke out all the way, pull the hand throttle out a bit or hold the pedal down a small amount, and hit the starter.
I have about ten oldies and this works on most of them for me.
I agree with the other post that you are flooding the engine then clearing it with wide open throttle. This is not the way to start a cold inline six.
Another good thing is an electric fuel pump. Let it run a short time then start it. I have no idea why this works but it does. Theoretically the carb bowl should have enough fuel to start without any pump pressure but my '60 White dump truck with a 385 flathead six will not start any other way??
If your ignition is not set up right it will sure make it hard to start.
