There are many 'bootleg' performances out there, not just official releases. The bass clarinet is not necessarily Dolphy, it could also be Donald Garrett who played with Trane throughout '65-'66. If you heard 2 saxes I would suspect that it was, because that was a usual line up. The second sax would probably be Pharoah Sanders, as Dolphy was already dead by that point. If it is not this later incarnation then Larryi might be right and it is Vanguard 1961.
Either way, there are tons of great Naimas out there. My personal favorite of all time is Stockholm 10/22/63 with the classic quartet (no Dolphy).
If you really want to get the best vision of the earlier band's version, get the Vanguard box set of all the performances of that week at the club in 1961. It has 5 or 6 disks, and the sound is quite good (for a CD). However the performances are STELLAR. The Dophy-Trane interaction is remarkable. It is a key series of gigs in Jazz history.