You will need a rubber grommet and I believe Steel has them -- if not, perhaps the hardware store will have something serviceable you can make work. It may take two doing it that way or perhaps a plastic hole plug would work. The proper grommet has a large diameter with flange for the 3/4 hole and a solid center you punch out for the small lead in wire. The routing is shown in fig 16 and 17 of accessories section of SM. Since the car didn't have a radio, hopefully the bottom Z or support bracket was included with the used radio. If not, you will need to make something sturdy to hold and support the bottom to hold it up and keep from moving in and out.
The manual says to connect power to BAT post of the accessory 10Amp circuit breaker (center of cluster) but that power comes from the (GA) terminal on ign switch. For practicality, whichever place the lead reaches or is easier. The radio should have an inline fuse in it's lead.
Manual antennas are available but don't believe anything aftermarket or modern will quite duplicate the original look because of the mounting nut and tip. Here is one that might not look too out of place if it can fit to the fender curve.
Antenna They have other options as well.
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