This guesstimation about wheelbase got me out measuring. Here are some Raleigh comparisons:
1971 Super Course: wheelbase = 41", chainstay = 18"
1971 International: wheelbase = 42", chainstay = 18"
1975 Super Course MkII: wheelbase = 41", chainstay = 17.5"
1971 Competition: wheelbase = 40.15" (no chainstay measurement as I don't own this one any longer)
1978 Competition GS: wheelbase = 39.5", chainstay = 16.5"
Neal