Changing Timing Cover with Engine in Car

I want to start by saying I have searched this topic and read through several tech threads hoping to find my answer before posting.

I am replacing my timing cover on my 360 because the current one seems to have a stress crack and is leaking. I know how to assemble the front of a small block on an engine stand but I am trying to brainstorm how I will get a good seal at the bottom of the timing cover to the oil pan with the engine still in the car.

When I assembled this engine on the stand I had the timing cover already in place and installed the oil pan last with the engine upside down. Are there any good tips or tricks to getting a good seal with the engine in the car? It seems like this will be tough to get a good seal since the timing cover will be going over the crankshaft.

Thanks in advance for any assistance.