In a nutshell, what they did was quite similar to taking a Chevy LS1 block, and putting it in an old Datsun - not impossible, but just difficult, and quirky.

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Installing a GM small block engine in a Datsun 240z/260z/280z was a fairly common modification. In the UK, a similar mod would be to use the Rover V8. Whether an LS1 would fit, I don't know.