When we sold them back in the 70s, I don't remember an owner's manual - we gave the customer a test drive.
Raising the seat should help your legs generate more power; adding a 3-speed hub will also help (any good bike shop could install it for you). To raise the seat, loosen the seatpost nut, and the rear "U" seat support should have enough holes at the bottom of each leg to raise the seat.