Chassis is NOT the engine block. I can't believe I just read that...
Most cars have a factory NEG from batt to engine, try to find that one and replace it with your 1/0. Otherwise there should be plenty of open bolt holes or a bolt you can remove and use.
Most cars have a factory NEG from batt to engine, try to find that one and replace it with your 1/0. Otherwise there should be plenty of open bolt holes or a bolt you can remove and use.