Yes a ignition power interupt switch will allow hot starting without kick back, and drama.
Where it goes depends on the ignition system used.
GM HEI it goes on the big pink HEI 12v+ power wire. 15a rated SPST toggle.
MSD 6 or similar CD box it goes on the small red power switch on wire that controls the box.
Also be sure the GM OEM starter motor brace is installed.
It is a required item
if yours is missing, get one.