Big 3

ok, so i am in the process of upgrading the big. i have found all but 1 of the big 3 wires. the ground to chassis. i see that a wire from my negtive terminal is what looks like it is going to the block or the cylinder head ( it dissappers) but i have no clue on how to get to it. any help would be help full.

ps how do you get a stuck side terminal battey wrence out from between my trannys valve body and the fender wall?

As long as the cable goes from the neg to somewhere on the chassis it will work, they dont have to be in the same spot except the ones on the engine.

As for the battery is a wrench stuck or is a bolt stuck.

If its a bolt channel locks or vice grips, if its a wrench take the batterys hold down strap loose and tilt it so you can slide it out. If its neither a little more description.