First of all, your engine is dragging. Try to jump it off from a newer vehicle and check all the electrical connections to the starter. If it still doesn't crank, put some starting fluid into the carb. Then try to crank again. If it cranks, you have a fuel problem. Make sure to put the air cleaner back on for safety. Basically you would have two problems, you're either not getting gas to the carb or not the correct mix through the carb. If it doesn't crank, it could be timing or electrical. Make sure that the order is right on the HEI distributor. Make sure the plugs and wires are good. Check to see if you're getting spark to the plug. Rarely the module in the distributor can go bad.