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First let us look at electric cars that do work. The Tesla Roadster (200 miles and more), the Leaf (100 miles), and some concept cars built by Japan and British researchers. Almost 300 miles on a single charge is possible. But no, that is not what you will get when you try to convert your rust bucket. You will get 50 miles when the batteries are new. 15 miles when the batteries are old. You will spend as much money as a new car cost.
You might fall into the same rut that we all did at the start. The assumtion that the more batteries the better. The bigger motor will be better. Heck, let's fill it up with 18, 70lbs lead batteries at 6 volts each and drive accross America.
Well, it won't work. You can't add that much weight to a car and expect good performance or range. I don't have to tell you how to do it the right way because it has been done and the cars are available for purchase.
Or if you really feel the need to build it yourself, do it like they did it.
I like to build my own stuff but, I really don't want the car that goes 50 miles at a time at a price of $32,000. Yes, I have seen a car that fits this description and I even rode as a passenger in it.
I was not impressed. I have a seen a whole list of cars that serve as expamples of how NOT to do it.