they don't currently make one for the 2.8, the closest would be for a 88-93 full size chevy, i think it will fit, but actually i think just an open element is the best way to go for the most power.
just my .02
Actually, I do remember seeing an air intake for our 2.8 a while back. I can't remember who made it though. I do remember that the price was WAY off the typical charts. More like $350ish...wtf. I remember after seeing the price tag, I decided to hang that Idea up and persue some other ideas.