Quick questions, any and all responses appreciated.

1) How well do diesels function?
2) Are Evolution and Thunder Tiger good conversion candidates, and if not, what brand is?
3) Does the added compression shorten engine life?
4) What fuel do they burn, is it actual tractor/truck fuel?
5) Any experiance with Davis Diesel?
6) Is Davis the only company that does this conversion?
7) Is an electric starter needed to get them going?
8) Will they start inverted since there is no glow plug to foul?

Ok, 'nuff, thanks in advance for any help.
Regards, Dan Rickerd