You have rear fenders that are 12" wide. You could squeeze 12s under it with some work...possibly.
I'd recommend a rear tire 11" wide(or 10 if you plan on corners) and 26.5" tall with the fronts being 7" wide( or 9 if you plan on corners) and 26.5" tall. Do not rely on the common 255/50/16 or what ever. You need to choose a tire that lists its dimensions.
Your best bet is to go to the tire shop if you can't measure backspacing. It is easy to do though. Just jack up the car, take the tire off and measure the distance from the rim mounting flange to the inner fender. Subtract 1" to be safe.
Summit has some tires to choose from but I don't think you will ever hook 800+ supercharged HP without some excellent suspension and slicks.