1972 CMC 3/4 ton 4x4 SB to BB Question

[Brads72Build]

I am rehabbing a 1972 GMC and am going from a 350 to a Big Block. In my research, I have found all kinds of conflicting info about the engine mount stands that bolt to the frame rails and the cross member. Will the stands for the factory 350 work for me at all, or is it just a mater of moving the locations,,,,, or finding BB mounts? I hope I have followed the right protocol on this, as I am new here. Any help from the experts on here is appreciated.

Thanks,