Embarrassing wheel base question

As I said in another part of the forum, I have a couple of embarrassing questions today. This is the second one. I should know the answer, but my brain is running on fumes right now from a hard week at the office.

Where can I find the wheelbase on my 1967 Dodge Dart 270 (225cid L6)? I'm needing to put a new exhaust on my car from the manifold all the way to the back. There haven't been any modifications to the vehicle -- it's still practically stock. I can't find it on the build card.

I feel like a putz for even asking, and I doubt I've provided you with the info you require to help me. Let me know what info I can add. Thanks for your patience!