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,

[Livrat]

The factory 350 crossmember/engine mount work fine (there are no factory big block mounts for a 4X4). The only issues is you will need to either modify the firewall to clear the valve covers and HEI. use a body lift to make the valve covers fit.. OR move it all forward approx 2-3" inches. If you move it forward a small block 2WD fan shroud works perfectly, the only downside is you have to shorten the front drive shaft, and have a new rear one made, Another way (assuming your truck is an Automatic) is to move the engine and mounts forward, use a 700R4 trans (which is a couple inches longer than a T350) coupled to the NP205, then all the other drive train stays in its original spot.

[Brads72Build]

Livrat, thanks for the info, it is appreciated. I have rebuilt the 205 and have built and installed a 4L60E transmission in it with all the driveshaft work completed,,,,, so when get the body work completed, I will go to work on either the fire wall, or a body lift if needed. When installing the new transmission we did move things forward about an inch and half, so I might not have much to do. I still have a 68 stepside that I built years ago, which I took from a straight 6 to a BB, but I have gotten a little rusty on all that I did several years ago. Thanks again, for the helpful advice.