If it is the decal glue, xylene (available at Lowes or Home depot paint dept.) will take it off without harming your skin and not too much objectionable odor. If it is other hard glue, sand it off. Fill cracks and dings with epoxy backed by fiberglass cloth on the inside
You can remove the side tins with the horsepower and Chrysler logo by grabbing the spring washers with an electrician's pliers and squeezing until they assume the shape of a taco. Then they slide right off the posts. They can most times be flattened and re-used but you can buy a box of 100 for a couple of bucks.If the center line tins are held by bent aluminum tabs, straighten the tabs carefully so as not to break them. If held by screws, simply unscrew them.
I tend to be a little anal or possibly demented about Chrysler covers. Last one I did, I repaired all cracks and filled all holes with epoxy. Then I removed the screws holding the halves together and split the cover. I sanded the flange and epoxy glued the halves together, added a few more bolts to the top and back, and started to prepare it for painting with lots of block sanding. I had hoped that the extra bolts and glue would reduce noise by reducing vibration. I also used a yoga mat that I bought really cheap at a yard sale and contact cemented it to the inside. It took a while but at the time I had a lot of free time
Then, after about 10 coats of primer and white gloss, it was ready for the decals. One rattle can will cover a good coat on the whole hood but not much more.