Rear suspension recommendations?

Thanks for all the advice-I am running a front swaybar with poly bushings, custom made strut rods(40% bigger than stock)and big block torsion bars. Anyone have any luck with shock extensions? A 4-link setup is probably not in the budget but are there any other shocks that might be an upgrade from the KYB's? Anyone have any luck with Mancini-type XHD springs that supposedly give an inch lift?