I don't know if this helps or not,- AC Delco has a compensator kit p/n 17111104 on their website, but it looks like it was only used on Buicks and Olds 307cid and 350 cid diesel engines.
Rock Auto sells it for $61.00.
www.rockauto.com You might try the AC Delco site and do a search.I couldn't come up with anything, but I don't know what yr your truck is..