I'm right behind you here with the same set for an installation. I think the current gaskets are original and leak like crazy. I've been using Fel-Pro PermaDry gaskets to fix chronic oil leaking valve covers on other Japanese engines for almost a decade. Old successful habits are sometimes hard to break. I could be in for a surprise with the 4.7L. So I'm keeping an open mind.
TIP: I put the seals in the freezer the night before installation. Freezing seals before installation and rubbing them with a very thin layer of silicone lubricant or oil lets them slide into place without damage. Also I will buff down any sharp edges on the upper part of the spark plug tube that might tear the seal during installation.
I've never had a bad experience using that approach.
Here's an interesting article about seal installation in the link below.
Proper seal installation is generally overlooked when selecting an oil or grease seal for any given application. Learn more from Know Your Parts.
www.knowyourparts.com
Did you receive a small package of o-rings with the gasket kit? I did and I can't see how I will use them.
I think I see you using Permatex Black in the corners to provide a tight seals.
I just noticed that Advance Auto sells individual spark plug tube seals.
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I install VC gaskets and tube seals very much like the guy in this video. with good results.