Defnitely a 1974 Raleigh or Carlton of some sort. You need to measure the seat tube I.D. more accurately. If it is about 26.4 mm, that's plain-gauge 531. If it is 27.2 mm, that's butted 531. If it really is 25.4, that's gaspipe tubing, so more like a Grand Prix. My guess is Super Course (if 26.4), but possibly Gran Sport (if 27.2).