which power steering pump to use on a 68???

[bdydrp97s10]

i bought a power steering pump off of a 78 caprice thinkinking it would work on my 68 c10. the truck has a crate engine in it. but for some reason the brackets and pump wont go in there.. nowhere for the bolts to go..

is it possible that there are two different powere steering pumps for a sbc, maybe one for a car and one for a truck..

let me know what you guys are rumnning on yours, and where you are getting them