Replace the Steering shaft with one out of a early 90's Jeep Cherokee. There's plenty of information on people who have done that swap... it's ALMOST a direct replacement.
https://www.gm***************/thread...ng-shaft.1812/
http://67-72chevytrucks.com/vboard/s...d.php?t=607429
This replaces the GM Rag Joint with a U Joint configuration.