1968 chevy to 1989 gmc suburban conversion

[ChevyBot]

Hey guys so here's the deal; I picked up a 1968 Chev C10 LWB pickup last summer and have decided to do a conversion to a 1989 GMC suburban front clip and drivetrain (with the exception of rear axle) and was wondering what you guys think? And what problems I will encounter! I have already figured out the suburban has a mechanical speedo and I need electronic for the gauges to work. Any help on this project will be much appreciated. I can post updates as well if wanted. Thanks!