BBC engine swap header question

[BigBore496]

Hi all- Great board!
I went searching, but did not find the answer. I am performing a bbc engine swap into a 1/2 ton 4x4 LWB (w/ air). The transmission is a built 700R4 married to the original 205 transfer case. I have moved the front crossmember ahead to match the length change.

I currently have the body off of the frame, so I do have a bit of flexibility as far as notching frame rails and the like.

What headers fit the best? Is there a "car" model that will fit? I would like to avoid the "swap" header that is made as it is BIG $$$...