Is there a gasket between the timing cover and the vacuum pump?

I recommend steam cleaning the area off first, running the engine to locate the leak, I use a large telescoping mirror. If it is the vacuum pump, it does use a gasket. make sure the pump itself is not leaking around the shaft. To change the pump, Disconnect negative battery cable. Position drain pan under power steering pump, disconnect vacuum and steering pump hoses, disconnect oil pressure sender wires and remove sender, disconnect oil feed line from fitting at underside of vacuum pump,Remove lower bolt attaching pump assembly to engine block. Remove bottom, inboard nut attaching adapter to steering pump. This nut secures a small bracket to the block. Nut and bracket must be removed before pump assembly can be removed. Remove upper bolt that attaches pump assembly to block. Lift pump assembly from vehicle. To install reverse procedure. Will take about two hours. Greg