i dont think its the distributer thats makin the noise, i think its the timing chain hitting the cover, sounds like a diesel if im not mistaken. if the chain guides are on wrong or not on at all that will throw off the timing and cause the chain to eat away at the cover and sling metal shavings which will cost a lot of money if you dont fix it right. my suggestion is to get a mechanics stethascope and find out where the noise is coming from then you will be able to asses the problem and fix it.