I would say fuel pump. Pull hose off carb. Put end in bottle. Turn ignition so electrics come on. Loads of fuel should fill the bottle quite fast. If not check pump is running (feels like its ticking) and that little fuel filters dont have water in. Check dizzy hasnt been rotated. Tighten...

Might be worth pulling the rad and cleaning it on the outside. Crap will stop airflow. Refit and refill. Make sure you havent got a full expansion tank. Needs to be about a third full. Do you have electric fans in front of the rad? If so check theyre running. Removing the thermostat may...

Firing order is stamped on engine head if you look at it from right front wheel... make sure the distributor securing bolt is tight. If the dis moves then it will advance or retard firing a bit. check the contacts in the dizzy head. If one is dirty this could be a problem. Check the battery...

Mate...I'm assuming you have a classic v8 carb... The clear plastic thing is probably a fuel filter if its small with a cone looking thing inside... The fuel pump is a metal cylinder probably bolted to the chassis under the passenger side door or further back towards the tank. Fuel pipe...