this guy used the stuff from a '83 suburban in his 1966 c20:

http://www.persh.org/pickup/pickup-beginning.htm

He has several articles on how he did some of it.

He even used the REZ kit that 64Fleetside mentioned:

http://www.persh.org/pickup/steering.htm


Check it out.

Here is a tech article from one of the truck magazines, using the same kit:

Tech Articles

Power Steering Retrofit - Make Your Classic Truck More Driveable
Adding Power Steering

By Bob Carpenter

http://www.customclassictrucks.com/techarticles/60_66_chevy_gmc_power_steering_retrofit/

enjoy,

-W

several vendors sell the kit from REZ, but this is their information:

REZ Engineering - No website yet, call or write - power steering kit.

used trucks to part out(particularly 4x4).

1960 - 1966 Chevy/GMC. -

PO Box 1584 - Great Falls, Montana 59405

Ph. 406-727-9267