68 K20 to 77 K20 frame?

[ponchonorm]

Have done a bunch of seaching for answers but havent been able to really find what i've been looking for so thought i would just ask.
What i have are a 68 K20 that was used as a pulling truck at one time and has been hacked up pretty good. Have a 77 K20 frame that was my brothers truck. Tranny/transfer and axles have been rebuilt. Also, it has a newer(88 and Up) bed.
Lookin for any insight on this swap. From what little i could find it sounds like the cab will fit with some mounting mods but cant find any info on any mods needed for radiator support etc.
Also, knowing about the difference in wheel bases, will it all work with the 88 and up box? Not sure how it will look but its what i have to work with now.
Not building a show truck. Its just a hunting/hauling fun truck.
Any advice,insight,links to other builds are greatly appreciated.

Thanks...............Marc