318 LA Engine Hot=Noise Dist.

Hey ,I've got an 318 LA engine and the thing that worry's me a bit is a noise that" i think " comes from the distributor when the engine get's hot!It's with the hot engine!!Yesterday the car started a bit heavy after 2 hours driving(The noise come's after 15 mins).The Dist. it's the same since i bought the car.And it doesnt look good.I'm runing with Eletronic ignition(silver box),MSD Blaster coil,and Original Dist.So i was wondering if Someone can Help Me!!!Is it realy the Distribuitor? :banghead: