Good point on block but.....thats the engine harness, alt, starter it is Biggest point in my post if the FRAME is NOT the ground plane. Block is tied into it as well but block isnt the "sole" plane. Firewall (body) to intake, Firewall to Trans bell housing, Dash harness,Taillight harness, Head light harness, look at the inner fender by battery, etc grounds all tie into the body in several spots. These gnds are NOT ran straight back to the block for EVERY ground so the Body is used. Cut it how you want .....body is used.