What is it about the 6.2L engine that makes you say that it looks converted? I'm not an expert on GM diesels by any means, but the only engines I was aware of that were based on gasoline engines were the earlier Olds and Caddy 350 diesels.

SteveM

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'93 190E/D 2.5 Turbodiesel 5-speed (daily driver)
'87 190D 2.5 Turbo rustbucket - parts car
'84 Dodge Rampage diesel - Land Speed Record Holder
'13 Ram 2500 Diesel
'05 Toyota 4Runner