Recommend you look for one of these:
- Mid-80s Trek frames
- Bridgestone road or touring frames from the pre-Petersen era
- mid '80s Schwinn road / touring bikes (particularly those built from Columbus tubing)
- RX-series Maruishi/Road-Ace (preferably high-end)
- higher-end Panasonics
- Centurions (yes, even with the fluorescent paint)
- Miele - (esp. Columbus-tubed)
- Japan-built Bianchi
Whatever you grab should be built from butted chrome-molybdenum steel and have proper lugs. Points will be deducted for TIG welding or aluminum.