Thanks BrianM.
My Chev is a 3spd column shift.
The GMC is probably a 4 speed, so I probably have to do something with the transmission cover as well.
Maybe I should wait for a 'perfect' cab, but they are getting hard to find.
I kinda prefer the big back window cab. That's why I'm going for this one. The other Chev cabs in Ontario are all small back windows. I suppose I could wait a while longer, as I have lots to do with the chasis, engine etc.
Anyway, I've got enough space in my garage for the cab, and I can get something done over the winter, then get on to the chasis when the snow is gone.
Thanks again folks.