74-75 were the years the Hei became standard on gm's ,they were and are a very trouble free system once they figured out they required 8 mm plug wires which was almost as soon as they hit the market .
I am surprised somebody bothered to install the rocket into a former chevy small block truck ,frame mounts ,tranny ,and lots of other stuff is different so it had to be swapped .I used to remove a ton of the old 350 diesels from these trucks ,and install rockets in them as they were a bolt in including the tranny and mounts because the engine was a 350 olds block converted to a diesel .I don't see how the financials could work out ,other than if the previous owner already had a swapped diesel truck in the yard and was bored one afternoon .
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