That's like a mid 60's cl 72, cl 77 or a dream 305. I think I have a clymer manual for it.
Close, but FYI: The CL was the scrambler with hi pipes. This is your seconfd choice, a Dream, 350 or 305 I can't tell. The Dream had the rectangulated fenders, shocks, covered chaincase, that's about the best features in that picture. They have heavily valanced front fenders, leading link front suspension, rectangular headlights...
Personally I prefer the 250/305 Hawk/SuperHawk model. But, the Dream is very popular in collecting circles and for general ownership, so I'm the odd man out. They must be a satisfying bike to ride and own.
As Brewsky says, with a 300 tank badge it is a 305cc. Model CA77.