What firewall and floor do I use?

[Oklahoma_k5]

I have a 52 that I am in the early stages of putting a truck 5.3 4l60 in. Well at least that's the motor I'm planning on. I haven't bought a motor or trans yet.

I have a bunch of rust in the cowl/kick panel area that fixing is my next step in my truck project.

There are a few options out there for floors and firewalls. From looking at pictures and reading build threads I see that a trans tunnel is required. ?????

But my real question.

Some builds have a stock firewall others have a recessed firewall. Thinking about fan clearance, height of engine for oil pan clearance, etc. does anyone have suggestions for keeping the stock firewall or putting a new one in with a recessed middle? I've been looking at the floor from absolute sheet metal that classic parts in Kansas City sells. Trying to figure out if I should put in a recessed firewall too?

Thanks David
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