accident damaged 740s go for pennies in the uk. I paid £1500 last year for a 740 taxed and tested with in good condition except for an exhaust leak, leaking petrol tank and needed a suspension freshen up. you should be able to find an engine easily.

How has the lpg conversion been? I was thinking of picking up a cheap 4.4 x5 and doing the conversion. seen 02-03 cars for around 5 grand and a decent lpg kit runs around a grand.