The rolls royce engine is actually a very strong engine. My dad had the top half of his silver spur's engine rebuilt, cost was around $5k, but the car had well over 200k miles on it when he did that, and only due to the head gasket finally going out.

THe GM conversion is a likely candidate, mainly because the rolls uses a GM tranny, Power Steering pump and Air conditioning compressor, which makes it much easier to do the conversion. I suggested it to my father, but he opted to have the work done on his versus do an engine swap.

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon - Sold
2006 E350 Wagon - 368 - Dead
2015 GL350 Bluetec - 197U