I have Garys cables and they are the best. They ground to the frame as well as the body in the engine bay and the trunk area. When ever changing or adapting the electrical system in a car, adding a ground to the frame is highly suggested. But keep all grounds to the sheet metal, just add the frame ground.
BH tuning, Transgo shift kit, Eaton posi W/ 3:73 gears, EDGE 9.5" 3000 stall , BMR rear lower control arms. BMR front and rear sway bars Hotchkis springs, CIA trans crossmember; 1.6 Pro magmuim RR; CIA budget headers w/ high flow cats; 2 1/2" cat back with X pipe; chrome dual cone CAI, 52mm throttle body, 30lb SVO injectors, Wilwood brake calipers, Power Stop drilled and slotted brake rotors, Bilstein shocks. Gary's 2 relay headlight harness. Gary's battery relocation harness