360 timing cover install- Help!

Only use the sealer in the corner where the cover, block and pan meet.
Use two large phillips screwdrivers (or equivalent) to locate the cover on the block through a bolt hole on each side of the cover and pry it down where it belongs.
Put a lower bolt in each side of the cover to hold it in place and continue assembly.

Keep in mind you want to get the cover to crank seal centered, so prying it down with the screwdrivers helps do that and the bolt on each side holds it there.