Exhaust Manifolds

Dan the man said

Myself, I probably wouldn't do a 340 /360 swap if I already had a 318. To do the swap there's the expense of buying the other engine, 360's are balanced differently so there's the extra cost of a converter LA 360's. The motor mounts are different than the 318's. I'm not complaining about the cost, just stayed what's involved.

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I could be wrong, but my understanding with the converter is just cut off the balance weight and you are good to go with a 360 to a 318. If the other way around, I have seen many just laying around, for cheap. The mounts are the same, depending on the year. The bracket from the insulator to the block are different. Just one side. I believe the 340 has the same bracket as the 360. So the other way around will work also.