I'm looking to buy a new vehicle to replace a 1976 Chevrolet Silverado my family won't let me restore, so I was curious as to what would make a great vehicle to start investing in?

Preferably, I'm looking to buy something domestic, will fit a 427CID big block V8, a 12" subwoofer on the rear deck, and also a couple of 16" wiper blades that can fit on a 9mm wiper hook, and I'm leaning towards a late model Cadillac. Anyone have suggestions on what would be a great car to use?