If you cannot find any comps following the advice of @Kerry Noble Jr, which is an excellent idea, it may be advantageous to meet with a Real Estate Agent, Property Management company, or even an appraiser to help determine the ARV. You can always find something to even ballpark it. I have seen homes in my area that do not undergo a full remodel that sell for as much as brand-new homes. I think if you are conservative on your numbers, you will be surprised.
Another suggestion is to play with the numbers. Be realistic in what you think the fully renovated house may go for and evaluate it. Find out what numbers would make it a deal for you and go from there. I highly suggest creating a spreadsheet that does the math for you so all you have to do is adjust one number and see the results.
I have attached a link to the one I created. Enter the information into the orange boxes, and it will calculate for you. I'd start with the information you have and adjust the ARV from there. Analysis Spreadsheet