70's Raleigh specs were notoriously loose, but tire clearance was "ample", but as you go from early to late 70's they tightened up. That said, 32's would almost certainly fit, especially if you're not running fenders.
Pictures of tire clearance around the bottom bracket and fork crown areas with current tires would be very helpful.
"One accurate measurement is worth a thousand expert opinions."
Admiral Grace Hopper
edit: "where I'm located now..." where are you located? Your gravel and dirt may be different than the gravel and dirt I ride on. Here in the PNW, forestry roads are ridden best without any real tread. Knobbies are only helpful when you're ridding in soft dirt.
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If someone tells you that you have enough bicycles and you don't need any more, stop talking to them. You don't need that kind of negativity in your life.