I took off the hoses, lines, linkage, intake manifold, etc., and have freed up the old valley pan. I'm pretty sure I can get it out of there without much worry much because I have a new valley pan & gasket in hand. But in looking at this more...and here is the question...how can I get the new one in without taking off one or both of the heads? I don't want to tackle that. So, is it advisable to grind away some steel on the pan...? 

I don't want to do anything before I get some advice from you guys here.

Also...the valley pan gasket is a pretty thick black rubbery sort. Should it go on as is, or will I need any sealant, and if so what's the best type? How difficult is it to apply that and then install the pan, with the heads on, and not make a slobbery mess of things?

As always, any input is appreciated. Thanks in advance.