yep. i didn't have any spare parts when i built up my conversion and it cost me way more than I would have liked.

OP- if you can reuse your crank, then the only real cost you need to worry about is a wheelset which will be $120. This is assuming you buy a complete 70s/80s road bike. if you are doing a build from a frameset (like I did) it will be a lot more expensive.