Don't be so quick to dump all those old components if they're in good working order. I've got an '82 610 that I've essentially left "as is". I did put a set of vintage suntour barcon shifters on it. I also upgraded the brake levers to a set of cane creek scr-5's (I just couldn't keep the suicide levers). The original suntour half step plus granny works great for touring. I did find a couple of NOS 12-34 freewheels to get a little lower gearing than the 12-28 that was originally on it. The old suntour derailleurs are tough and pretty indestructible. There are also some good choices for 27" touring tires out there. Just don't forget the brooks saddle.