sb collant leak at timing cover??

I've had this a few times. The aluminum cover pits and corrodes. Had it on Dakota 3.9s, also LA and magnum v8s
I've found that by using a quality antifreeze and a 50/50 mixture of antifreeze and water that the timing chain cover will not get pitted, also it's a good idea to drain and flush the coolant system every 3 - 5 years, I prefer every 3 years.