Hello Everyone

I am new to the site, I recently accured a 1970 Challenger Convertible with 25000 miles on it. It has been off the road since 1988. It was stored inside buy not well taken care of. The cast tank in full of rust and now leaks. Who make a good repro tank? Paint and interior are in good condition. I would like to keep it original and show is as a survior. The jack has never been used. Most of the marking a still on the car. I would like to clean it up and get it running again. The heads were pull off to check the cyclinders. They look really good. The brakes are still hard. I would like some information on how to bring it back to life. The paint needs cleaning and buffing. There is some 40 year road crud and what appears to tar. The door panel are white and has turned like a cream color from age. Does anyone make a paint or dye for them? It has the orginal carb. Should just buy a replacement or have someone rebuild it? The color of the car is mango orange with a white top and interior.