The 6500 series is compatible with any 9 Shimano speed brifters. You will need a 9 speed crankset as the 9 speed chainrings are narrower than 8 or fewer speeds, and you will notice the difference while shifting. You were smart to wait and buy the BB with the crankset for compatibilty - do that. I've used the threaded to threadless adapters with no issues. Separate clamps to adapt your braze-on FD are available for about $10. Nashbar/ loosescrews /LBS,etc all have 'em. Used those, too. I prefer the ones that have a slot to move the FD up and down without having to move the entire clamp. Think mine came from Nashbar. Did this bike have 700c or 27" originally? If 27" you may end up having to buy a longer reach brake. A mid 80's frame should have used recessed nut brake mounting so you should be OK there. Do you know what size seatpost? If it's a 27.2, ebay is a great source because there are so many available and you can pick one up cheap. Used American Classics have a good weight/value for around $20 incl shipping. Thomson's are lighter but run more toward $50+.