Slant hesitation

Problem is heat-related—could be fuel or electrical. Make sure you have the correct thick (about 5/16") base gasket under the carb. Make sure your manifold heat control valve and thermostatic air cleaner aren't stuck. Put a hot hairdryer on the electronic ignition control box and try to make the engine stall by heating it up. Same problem could afflict the pickup coil in the distributor or the ignition coil.

Parts store "remanufactured" carbs tend to be junk, but do the best you can with what you have; Carburetor operation and repair manuals and links to training movies and carb repair/modification threads are posted here for free download, and Tune-up parts and technique suggestions in this thread. Go through systematically and make sure everything checks out, including the valve adjustment. Do the Fuel line mod.