looked on WikiPedia (I know, not always accurate, but take it for what it's worth) and found this page on the GMC Jimmy/Chevy K5 full size models:
http://en.wikipedia.org/wiki/Chevrolet_K5_Blazer
Looking at this page:
http://en.wikipedia.org/wiki/Chevrol...ock_engine#350 down where it says L98. I take that is the engne it has, 230hp, 330 lb ft.