What dipstick and tube will work?

That's one cool truck. I think you are on the right track with your last comment.

I'm building a '57 Dodge D100 for a buddy with a shortend 1994 Second Gen Dakota Frame and am wondering about having to cut the firewall and floor pan to fit the engine & trans. What year chassis did you use? Can you post any pictures of the engine installed. Confirm you are using the mid-block motor mounts? Which transmission is that?
No cutting of the firewall was needed. Used a chassis from a 2000 dakota and shortened the frame 23 inches.
Used the mid block mounts. The transmission is a 46rh. I will post a pic of the engine installed once I get it in there the next couple days.