I think I would have gone this route.
http://cgi.ebay.com/ebaymotors/CHEVROLET-350-5-7-VORTEC-REMANUFACTURED-ENGINE-_W0QQcmdZViewItemQQhashZitem1c1920324bQQitemZ120680624715QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories
But this is the one I want...
Crawl up under your front end have someone move your wheel back and forth while looking at all of steering linkages. I just replaced my pitman arm on my tahoe had alot of play in it. Had my seven year old move the wheel back and forth while I looked.