i like the 6.2 option. i don't think they are a highly rated engine as far as diesels go but the motor mounts should be the same as your 350 and having the trans with it is nice.
a friend has a 6.2 in his G30 and it went 235,000 miles fine. then sat a year and needed head gaskets. i would not be afraid to put one in,
veggie oil kits are easy enough to install and use, but a system to make your own bio-diesel is not too hard either if you have a little space. i think that's how i would do it if i was doing it over again
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