[praisegeetarman]

Are you running headers? Part of getting the choke to operate as original is the valve located on the outlet of one of the exhaust manifolds. When the engine is cold, that valve closes and forces the exhaust gasses from that side through the center port in the intake manifold (the one that the choke stove is bolted to) and out the other exhaust manifold. Those gasses going through the intake heats up the choke stove faster than it would if you have headers or a gutted exhaust manifold outlet valve. You can still get it to kind of work without the exhaust outlet valve, but the choke will stay on longer than it should. One way to compensate is to bend the rod connecting the stove to the carb linkage so that the choke doesn't go on as far.

Like others have said, if things aren't exactly stock on the motor you have to fiddle with it to get it to work.