If you want to stay in the commodore arena, I would go older model. Something like a VL is 1250kg's give or take dependant on model.

Doesn't take a whole lot of stonk to get something like that into the 10's. Good choice of engines, RB30, Holden 5L and plenty of kits for LS1 conversions.

A suitably head and cammed LS1, glide, BW78 Turbo Diff and a 100 shot would see it in the 10's with ease. Probably even a low 10.