Mine's about that low and I'd say it still handles pretty good
That's #425-lb coilovers on Koni's and an MM front end. Rear end is 550-lb conventionals on adjustable-height LCA's and a lot of ing around with pinion angle. I don't think you'd have any hope with longtubes but that's just me.
My fronts with mm coilover kit 150#spring(street/strip). This is as low as it will go and still have clearance. Lower by about 1 1/2" lower than stock. Rear is Team Z drag springs about 3/4- 1" drop from stock.
Check your bumpsteer on your front end if you go low. Look at the angle of your control arms up front. Ideal for handling is to have them horizontal (level with your k-member). You probably won't be able to achieve that, but somewhere between 5*-10* will make your handling feel nice and tight.
Get a MM front end if you can swing it. Their standard setting k-member will move your front wheels forward 3/4". This will change your caster setting in a positive way and really change your handling a lot.
Lowering alone will cause you bump steer issues.
BTW, who's blue car is that? I absolutely LOVE that engine bay!
UPR coilovers with cc plates and 425lb Springs. The rear have team z street beast control arms and stock Springs with no isolators.
Car handles well rides nice and smooth, no way I could run longtubes with the engine drop mounts I have.