What should I do with this old Duster?

My brother and myself restored this old Duster a few years ago. We were going to sell it and try to make a little money. Now we are thinking about converting it to a V8 and making a fun car to keep out of it. The body is very solid and the interior is really clean, it just needs a little go power. The problem is that we are not very well versed in what combinations will work in this car. We are looking for some common sense suggestions.
Thanks,

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Author: tobacjones