The Mighty Red Flinger makes this one look easy in the video below, finishing the level with 2 birds for 93K.
The first Matilda goes out at about 45 degrees, dropping the bomb down the first chute to break the plank. Her carcass then bounces off the stone just under the piggie up top, knocking the little green guy over to set in motion the giant boulder of death, which rolls down the hill and hits the TNT to rack up some points down there. Meanwhile, the carcass manages to fly back and drop back down the chute to kill that first pig on the left. The second Matilda takes a slightly higher route, dropping her egg on the pink horizontal platform and ricocheting up into the loopty loop tunnel to come back around and hit the TNT there, which finishes off the level.