SBC/BBC Z bar

[notchbackgta]

I am new to these trucks, so if this has been covered a lot please excuse me. I have been reading here for over a year now, since I got my 69 C10.

Currently the truck has a 307 with a 3 speed. I pulled the 454 out of my Camaro since I thought it needed valve guides and possibly rings, but it turned out to be the intake manifold gasket sucking oil out of the valley, so I had some rebuilt heads I put on it and I want to put it in the truck now. I am going to a 6 speed, and want to keep the mechanical linkage in this vehicle. I am going to use a 621 bellhousing with the McLeod adapter plate and an extended pilot bushing.

My question is, do I need to get a different Z bar for the BBC? I have no experience with manual clutch linkages, so I am not sure whether the Z bar for a BBC would be narrower between the pivots than with the SBC. All my other cars have had hydraulic clutches, so much easier and less parts...

Thanks for any answers, I want to get as much mocked up in the LWB frame I have before I do anything to the truck.
James