Congrats on the vintage Trek. I generally like the vintage components over the modern day replacements, but as another member stated earlier, the Bottom Bracket is where I generally replace a vintage part with a modern part especially if the original bb is not a high end unit. IMO, a cheap modern sealed cartridge bb is smoother than a cheap vintage bb. Also if the bb shell has not been faced, a sealed unit is the way to go. A new sealed modern cartridge bb can be had for less than $20 on sale.