[Mike C]

I’ve never seen anything but a TH350 behind a small block in a 1/2 ton truck. Big block 1/2 tons got the TH400 but 307 or 350 in those years would have a TH350. I have a ‘69 3/4 ton truck that has a 350/TH400 combo and I have a ‘72 3/4 ton Suburban that has a 350/TH350 so those combos do exist.

I’ve never heard about smaller motor mounts? All of the small block 67-72 trucks used the same through bolt mount where the bolt comes in through the middle of the stand. Some are physically smaller appearing because they do not have the safety interlock arm on them but they bolt in the same way and the rubber mount is the same.