Screw that! I did a block heater in -30. Car was dead and there was no getting it started without it. Actually my brother’s 71 mustank.
I know now how to get a frozen car running.
I’m too old now to choose to work in that kind of cold anymore. Hell, I need to swap out the battery in the SRT and I’m waiting for a dry day above 45* to do it! LOL!