I'm looking for some help 1966 Barracuda

I am getting ready to pull the trigger and purchase a 1966 Barracuda w/ a 273 auto w/ 92k original miles. I have some questions. It's in near perfect condition w/ matching numbers and the interior is like new. I need some parts and it needs some minor exterior touch up. How much should I pay and will I be able to locate the following? Drivers side door arm rest, Barracuda script passenger side, chrome trim molding that runs along the outside lower section from front wheel well to back wheel well, console that includes the gear indicator, chrome pieces that fit on the front top fenders, ash tray, 4 barrel carb? Thanks for your help! This will be my first venture into classic cars and I'm a bit nervous about pulling the trigger.