5.7 vortec into my 77 truck?

[tomdog77]

Hello I'm new to this but was checking it out and see a lot of good help on here. I have a 77 pick up I've been building as an off road truck. The truck is pretty stout itself but after a recent trip to the hills I did like how my carbureted sb 400 cut out on the hills and rocks. I picked up a 5.7 vortec last year with the factory harness, computer and all. I would like to put the top end from it on my 400 since its a fresh block and runs strong. I know i need to drill the steam holes in the heads. Far as the factory harness can i use it? And just flash the computer I have? Anyone have some tips or problems I might run into?
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