68 GMC to a 2003 Tahoe chassis

[thetucks]

are you planning on using the tahoe firewall? what about the floor? I have seen a couple guys use the whole floor and firewall together but they intended to use the tahoe dash. They did have an issue when using the tahoe floor making the truck cab fit to it.

I used just the tahoe firewall on mine because I wanted to use the truck dash. If your not going to use the tahoe heat and air system you dont need the tahoe firewall though. It really depends on what all your planning on using from the tahoe.