65 chevy short step
4 speed 283 motor

i wish to install a dual exhaust, something that sounds nice and healthy but also something that wont rattle my wife's teeth if she rides in the vehicle.
i installed a square under bed gas tank from early classic enterprises so that will be a factor to consider in installation.
my preference is to have the exhaust exiting straight out the back (are there any links to pictures showing different exhaust exit options?)

are there any vendors who sell prefabricated bolt on systems or are most exhaust systems for these trucks custom made at a muffler shop?
also any recommendations on muffler choice?

thanks for the advice