Personally I would leave the 292 in the 63. The transmission and transfercase from the Burb or Blazer should bolt right up. You'll have to cut holes in the floor for the transfer case.

Your next step is gutting the front suspension from the 63. You'll have to get spring hangers and mount the steering box from the later trucks. If your frame widths are different, you'll have to weld some spring perches to the newer axles.

It's alot of work, but definately able to be done.

I found this link, it gives the frame dimensions from the 73-87 Chevy's.

http://www.chuckschevytruckpages.com/framespecs.html

http://www.chuckschevytruckpages.com/models.html

These guys have all kinds of custom fab parts.

http://www.ballisticfabrication.com/

http://www.offroaddesign.com/aboutus.htm

Good luck

1954 3600 Chevy Truck
"The Fake Truck"
In the Stovebolt Gallery
More pix on Photobucket