A block heater is going to be tough, I think you will have to get your car up on a lift, and even then, it is hard to get in where you have to be. I got one and returned it after trying for a couple hours to get it in. I got nowhere. I did manage to get a pneumatic wrench hooked onto the frost plug but could not get it out. since the car was on the ground nothing would give me the leverage that I needed. My current motor already had a block plug heater in it, lucky me.
I took it back and got an adhesive oilpan heating pad instead. It worked fair. they have to be adhered to a flat surface, so I ended up with a smaller one than was recommended for 2 gallons of oil. It would only heat the oil and not warm the whole engine as they claimed a bigger pad would have. Nevertheless, it worked well enough, kept the oil warm and made startup much easier.
installation was cake, clean the pan, peel off the plastic and stick on, then smear a bead of (included) blue silicone around the edges to seal water out.
It was about $40

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andy t
'78 300d
'95 volvo 850, wagon
'86 300sdl - engine out, maybe I'll have it rolling by June

whole bunch o' bicycles