Rob our EaAU6081 is going to be the closest. The size is a little longer & you will need to make sure you have a couple more inches of space for it. Your K&N is about 6", the Amsoil is a little over 8". It is a dry filter. it can be cleaned with a shop vac or by blowing out with low pressure air.
Amsoil Number EaAU6081
Product Style-Round Tapered
Base OD 7.5"
Flange ID 6"
Flange Length .625”
Flange Type Centered
Media Height 8"
Top OD 5"
The pre-filter is a great option. It really saves wear on the filter and catches all of the big dirt particles & bugs.
Here is more info on the Pre-Filters.
Here is the filter & pre filter on my 4.7L.
And Matt, Looking forward helping on your project if I can.
It looks as if I can handle the filter being 2 inches longer.