chassis fabrication/hotrod shops san jose

There are lots of places out there that do that kind of work. I'm not sure who to recommend, but get yourself to a Mopar Alley club meeting and ask around.

As for the paint/body. If you're not looking to spend a fortune and only need a little prep work, you can do worse than Maaco. they don't do a bad job putting down paint, they aren't real good at masking. Remove all trim/bumpers/lights/etc. and you have a fighting chance to get something nice out of them.