[C10 - C90 Bill]

It's a little hard to tell in the picture but the Cab Lights do look like the original type Yankee 77's that GM put on many of their trucks, unless you are talking about the "Fireman's Hat" type, which in that case you will need to change out all or part of the cab roof.

We would also need to see a picture of your sheet metal problem, but many of the pick-up truck replacement panels will work.

I've seen Tilt's in pictures, but it will take a fair amount of work to accomplish it.

I would have to break out my books to check on the rear Ratio, but you're right, it's probably pretty low.

Welcome to the site, by the way.