New truck, new member, few questions too. Canadian GMC content

[T0rch]

Hey guys, new guy here with my first one of these trucks. A little while ago I sold my 2014 Tacoma because I was sick of making the massive payments. I build motorcycles and it's nice to have the longbox because I can drag bikes around with a closed tailgate.

Anyway the truck is (seems to be) a 1969 Canadian spec GMC 1/2 ton Sierra Grande with the Custom Camper package. 350/TH350. The badges say 910, which I understand was the Canadian nomenclature for the c-10/1500 trucks. Near as I can tell, the SPID backs up the badging and features. Nearly everything inside works the way it's supposed to.

I'm not sure if the paint color is correct; I doubt it - it's definitely been repainted at some point. SPID says "1001MI SPECIAL PAINT" so it's possible but have no idea.

Plans for the future are to lower it a little, get some new era-correct mags or steelies & white letter tires, and disc brakes up front. Also power steering. I live in the city, so the manual steering is killing me with parallel parking and etc. I've heard that any power steering gearbox/pump setup from any of the c10s up to the 80s will work on these trucks, is this correct?