HI EVERYONE

I'M NEW AT ENGINE WORK BUT I'M LEARNING EVERYDAY.
HERE'S WHAT'S UP WITH ME.

I NEED TO GROUND THE FIREWALL ON MY '66 MUSTANG.

I'M TOLD THAT A COPPER BREADED STRAP IS BEST. O.K. I'VE SEEN THEM.
PROBLEM IS: I'VE BEEN UNDER MY CAR AND CAN'T SEEM TO MAKE HEADS OR TAILS WHERE ON EARTH TO CONNECT THE STRAP?

I KNOW IT GOES FROM THE ENGINE TO THE FIREWALL.

BUT WHERE AND HOW ?
I CAN DRILL HOLES AND CONNECT A STAR WASHER TO A SHEETMETAL SCREW IN ORDER TO GROUND THE FIREWALL ~ IF THAT'S THE PROPER WAY I BELIEVE.

BUT AGAIN JUST WHERE TO DO THAT ? ? ? ?
PLEASE GIVE A GUY A HAND.

THANK YOU ALL AND