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@cagimaha
Yep, I'd go with XS650 too, possibly in a Champion frame. The tiny rear sprocket is a bit of a signature for them, they've got very short primary gearing so the back sprocket always has to be small even when they're being used on dirt.
Red Max Speed Shop do some smart bits for converting them for flat track, not necessarily the cheapest of projects but if you wanted to buy something to gradually do up whilst riding it it's not a bad choice.