I have a 70 Jimmy that came with a 350/SM465/Dana 20. I retained the SM465, but swapped in a crate 502 HO and NP 205. The question is this: Does anybody know of a specific header I can use? I used small block motor mounts, because I couldn't find big block mounts for a 4x4 of that vintage. The small block mounts work fine. Clutch linkage in the way isn't a problem because I'm running a hydraulic setup. Any advice is appreciated, even if it requires swapping the mounts. I even ordered some mounts, but I'm pretty sure they were for a 4x2 version...they didn't fit.