AIR, this bike has a 1" steerer and quill stem. You'll have difficulty locating a new fork for it that isn't just a pogo stick, but there's a guy that's very well rated who restores old (oops, vintage) forks; check the mountain bike site. You'll need to decide on either a hub drive or mid-drive. If it's a rear hub system the dropouts need to be spread (probably 10 mm) to accommodate the wider hub systems, which isn't too difficult, but front hub or mid would be better IMO. I converted a slightly more modern Diamondback Axis with a rear hub and it's a good bike.