[Pontiac]

A Studebaker 6 cylinder matches the clutch housing. tight front and back but has been done and there were lots of studys available.

I can see that being done but it would also require replacing or augmenting the front springs to compensate for the added weight.

And it does not seem to be what the article suggest he did.

He also rebuilt the engine to make it faster.

I would also doubt that the engine swap would be common knowledge because the Jeep was a completely new vehicle only available to the military. He or other mechanics in theater may have figured it out but it seems a stretch.

[PeterPrinciple]

I would also doubt that the engine swap would be common knowledge because the Jeep was a completely new vehicle only available to the military. He or other mechanics in theater may have figured it out but it seems a stretch.

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Swaps were quite common.

The Lhead engine was a prewar engine, much improved in 1939 http://www.fourwheeler.com/features/1408-the-willys-go-devil-engine-jeep-encyclopedia/

But in rereading it, “the rebuilt to make it faster” most likely means rebuilding a worn out engine...............