hey guy have a chance to pick up a 99 firebird. My concern is the miles it has around 115k. My buddy has owned it for the last 2 years and has never sprayed it(broken line and he is lazy) but when he got it their was a bottle in it. It also is ram air, headers, catback and he had the tranny beefed up because it went when he first got it. what kinda miles do these engines normally see? what do you think its worth inside and out are in good shape.