I will be fishing in very heavy grass . What is the best jig for not getting stuck and pulling up a 2 pound clump on every cast?

In the situation you described, you'd be better off using a "T-rig jig" (Luck-E-Strike - Owner - Jobee).

But if you're set on using a skirted jig with a weedguard, than I'd suggest a "swim jig"

but instead of swimming the jig, retrieve it in your usual fashion.

Outkast Swim Jig

Roger

The best one that I have found for grass is the Spot Stalker by Bass Stalker.

Oldham's Lures Trailer Hitch Jig