vortec 454 swap into a 68 K20

[grass]

New to the page and to classic Chevy's, I have been searching for a couple weeks now for any info on swapping the drivetrain from a late 90s k2500 into a 67-72 Chevy k20 4x4 chassis, and I haven't really found anything. I have a 68 K20 with a mild 350 and turbo 350 mated to a np205. I also have a 97 K2500 suburban vortec 454 with 4l80e. I am looking at swapping the whole drivetrain from the burb into my k20. I'm trying to find a way to just bolt the 454 in, I'm not concerned with the cross member, I've built many cross members so that is not a problem, any help here would be greatly appreciated. Pics are what it looked like when I brought it home and how it looks now.