Water leak question

I assembled my 360 and have it on the engine stand but after filling it with coolant, I noticed it drips from one of the timing cover bolts. I'll have to pull the water pump to get to that bolt but was wondering best practices to prevent it from leaking going forward. I covered the threads with TFE past when installing the first time. Should I have used something different. I only want to take it back apart once. Thanks,

Brian

Water leak 2.jpeg