I love the SN-95 option. You are right, yes they need not only suspension but some chassis stiffening. But parts are super cheap.
I wanted my 01 Bullitt to not ride and handle like a pickup truck. IRS swap, springs, shocks/struts, and bushings and the car handles FANTASTIC. Power? 4.6 cars- add a second hand Vortech kit. $2700 and you're making 380ish WHP to the tire with a few bolt-ons.