Hesitation issue can be a PITA. Start with what has been suggested. Use a dwell meter for the best setting of points(most have a tach function as well). The dwell angle has to do with coil saturation. Fancy ain't it? That just means the spark will be fully developed when it comes. When all else fails,that means you have done all of the suggested things, then you can try these. 1, set the air mix screw with a vacuum gage. Use the port on the intake manifold under the carb. Often used to run the wipers. Set the idle to about 500 rpm, and adjust the air bleed screw for max vacuum. With the timing set close to right, blip the throttle. Does it bog? No, you are done. Yay you. It still bogs? Yup? Well there is one more thing to do. After the accelerator pump has been addressed. You still have, the metering piston. Yeah, that thing. It should be free and move the ball off the seat. If it is sticky in the bore. Then remove it. Place into a drill chuck, thin end in the chuck. Get some 600 or finer wet or dry sandpaper and polish it. It is brass and you will have 1 pretty part on the truck. Check the check ball. it should move and reseat with just a bit of spring pressure. Reassemble the carb. Try again. It got better right? There you have it. Do not bend the skinny end of the piston, just make it(the piston end) shiney.
