Are you talking about the 6.0L iron block LS1 derived Vortec truck engine? If not, what is a "6.0"? From looking at my Silverado, that engine appears to be even taller than the passenger car 5.7 LS1.... as a minimum you would have to get rid of the big boxy intake manifold. That is also a fly-by-wire TB setup in the latest incarnation.
You would need a complete engine, a complete wiring harness and a complete computer.... probably several, since over the years, they seem to be setting these things up with more and more separate "modules".
Then, I suspect the reason the 98+ hoods sit high enough to cover the wipers is because it has to be high enough to fit over the LS1 engine.... the 6L truck will be even harder to fit, so naybe a complete front clip swap from a 98+ is in order.
This is NOT high tech... you need to figure out what you want to do and focus.... I don't even know where to move this, but it belongs on LT1 Tech or LS1 Tech.... I suspect people on LS1 Tech have dabbled in the truck blocks, so I'll move it there.
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Fred
94 Formula A3: 381/TH400/N2O
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11.513@115.59 on motor; 11.162@127.67, 1.643 60' on a 125-shot. Going with a 275-shot this year