[KOG]

Yep, those would be for PS pump mounting. Find almost any Chrysler small block V8 from the 60s into the 80s and look at it. That might be the best way for you to see exactly how those things fit.

 

[ImperialCrown]

Welcome to Allpar. Most any Dodge/Chiltons/Motor/Mitchell service manual from this era will show the front V8 engine brackets and pulley positions. It would also be worthwhile and help you out a lot by getting a manual to do any type of work on the truck. http://compare.ebay.com/like/160658479302?var=lv&ltyp=AllFixedPriceItemTypes&var=sbar
Hold the brackets up to the p/s pump to see where the bracket mounting bolt holes line up to the threaded holes in the pump.
There may be a slot to slide the bolt in to get proper belt tension.
Look for the 'shadow' in the paint left by the bracket in its previous mounting position for clues as to its correct location.
The round washer marks left in the bracket paint should face the front. Maybe some of these images are similar to what you have?:
000013E6.jpg
mP3cyr3dQux4GNlw4EXNd_w.jpg
318RemovelPrep128Custom.jpg
muNH_36HLjPfmA7wZzm5cjA.jpg
2010-07-12_171908_1.gif
pump_brackets.jpg
index.php
PS1.JPG
83_PS_pump.jpg