I don't know if there is an actual kit out there.You can get a rebuilt 87-92 I-ROC or T/A box(Cardone part#276550 which is the fast ratio box,with some effort),power steering pump,Moog pitman arm (if you need to change it,I think the correct one is like 5 7/8"),hoses at any auto parts store,line adapters for the new box (they install in the new box,it's metric your old one isn't),new rag joint at Lee Manufacturing 1-818-768-0371,they are familiar with the swap.I'm sure you could find the misc. parts(pulleys,brackets) at one of the resto houses or maybe the bone yard.I seem to remember having to remove a check valve on the Cardone box that I used,with it in it ran a little too hot.Nice improvment over stock with out blowing the budget.Long or short water pump on the crate motor,makes a difference with brackets and pulleys.
http://www.alangrovecomponents.com does carry an assortment of after market pulleys and brackets,I used one of their brackets for my P/S pump,nothing fancy but it worked.