I built a 54 Dodge pickup years ago. Adding any V8 into the 49-57 trucks will require a big cut into the firewall. The nose is short, the firewall is tall, with a large angled toe board. There was a recess in the firewall for the flathead 6, and when they added the V8, it sat almost centered on the front axle. None of this makes adding modern drive trains easy without cutting into the firewall. To give you a mental picture, the firewall will have to come back to about the bottom of the dash, at least as wide as the motor & exhaust. (Wish I still had the pictures of my 54 to post.)

I have a 47 cab, grill, hood, and box sides that will someday be a truck. Rough tin is the story of my life. I'd love to do a 5.7, but right now, that's a big dream (for it to even become a truck is a pretty big dream at this point).

You all keep posting pictures of your stuff, I'll live through you, until I can move forward with my 47 project. Gene