The engine brackets are scarce as hens teeth for your engine. You MUST have the brackets for the 230 & early 250 with the separate intake manifold. The brackets for the later head and intake cast as one piece won't work on your engine. However, the car and truck brackets are the same,so any Chevy with a 230/250 up to about '75 or '76 will work as well as any other GM product with the same engine.
for a picture of what you can use and what you can't.
Stick with the truck pump and box. Get lines for whatever year it came off of. Replace the pitman arm with a new Power steering kind. They are different.
Best wishes and good hunting,