I'm not sure how much you're willing to spend on it and how much you wish to become a self taught Landy mechanic, but I know where there is a Series III Stage I with 3.9l Isuzu motor, plus all the running gear and a nice Aluminium canopy which you could make an offer on. It's owned by a friend and I think he's after about $3000 ono. The chassis & firewall has significant rust however ...........
If your chassis, firewall & body are in good condition it would make a nice engine swap, give you some spare running gear and you'd end up with a sought after Isuzu Diesel Landy.
And you could probably sell some of the running gear to recoup some of your costs.
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Anyway, just a thought to get you away from a problematic V8.