Oil leak on 5ktq

[JJK1204@aol.com]

I have noticed an oil leak on my 87 5ktq with 140k miles. It is around the 
oil filter housing. I have replaced the oil filter and inspected the sealing 
area, it's fine. The oil is on the back of the alternator, the positive cable 
bundle, both of the external oil lines and is hitting and smoking off of the 
exhaust pipe where it bends and it's front is exposed. Any common places I 
should look? Are the external lines prone to cracking at this mileage?

TIA,

John Katos