I too recently picked up a V90, I mean 960.
In the middle of the 1997 model year, Volvo renamed the 960 to V90.
V = station wagon
90 = full size, rear wheel drive
In a simular fashion, Volvo renamed the 850 SW to the V70. Same car, different ID.
I have the same in-line 6, W/S/E thingy and rear wheel drive.
My owners manual talks to the cars as being identical (for 1997).
So far, so good.
Steve