Only if they had A/C (which most of them did). But they still had the mechanical. I ran a couple with just the A/C fan, but here in northern MN, we're not pushing cooling systems very hard. In AZ, I don't think you'd get away with that.
Yea, remove it, measure the opening, buy a universal electric fan. Either use the included mounting "hardware" that pulls through the radiator (puts a little extra strain/vibration into your radiator, frequently it's fine), or make some brackets. Wire it through a relay, and either use a toggle switch, or you can utilize the factory switch for the existing electric fan (that one is wired without a relay, I would not put the load of 2 fans through it, though).