350 Vortec to 454 vortec

[b454rat]

I tried searching all day but it's a pain on an iPhone. I have a tired 350 in my 99 crew cab, and local junkyard has a 99 3500HD with a good running 454. Some places I've read said it was pretty much plug and play, others said it was a total nightmare. I know the ECM wiring should be the same, just dunno bout connectors and what not. Gonna stay with auto for now. I can get the whole truck for $1500, 454, NV4500, clean title and body. Plus later on down the road, I wanna build this truck up...