This is an interesting thread still. To me what it comes down to is cost and intended use.
AFAIK a LS1-3 v8 will cost about $15-25,000, maybe more or less depending on which options you want and if you do any work yourself.
The 3.2 td5 could be a similar price, maybe more, maybe less??? with better efficiency, but less powerrrrrr

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The td5, puma3.2 and tdi all weigh at least 50-120kg MORE than the ls3 which is about 185kg.
The ls1-3 has a few kits available, marks and the usa one are the first to mind. Also with the patrol hand grenade there are several places who are experienced at these types of conversions.
The puma3.2 will be efficient and good for distance towing, but if the majority % of your driving is low km short distance, a similar cost ls3 will pay for the extra fuel cost with a grin factor.

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