Conversion of GMC 2500, Stale oil smell

I am new to wvo conversion. What is the best Heavy duty pickup to convert??? I like the seats/comfort of the GMC 2500 myself. Is this a good one to convert? Are there fuel filter/injector problems??? And lastly, Is the stale vegetable/french fry smell that I observed with my sister's Mercedes wvo conversion prevalent in most conversions??? I sell goods that would absorb that smell negating my ability to sell... so this matters. anyone who can give me as much info as possible would be appreciated. Thanks.

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