Depending on the size of tires you get -- you're going to have to roll your rear fenders -- and, depending on the offset of the wheels, clearing the front struts is going to be next to impossible with an 8.5 inch unit. Then again, I don't have all the data here -- so it's hard to comment.
24535ZR19s up front, with a tire featuring a rounded shoulder design, like the high end Michelins, should work. Can't say for out back. I'd say do the same tires out back so you can rotate them -- but a meatier tire in the rear, especially with a slightly thicker sidewall, would look totally tough. Try using the search mode here and at http://www.ls1gto.com
If these are custom wheels that can not be returned, your best bet is to call the wheel manufacturer and work with them to get a recommendation from them. In fact, send them a photo of this car and see if they remember who they did it for.
If these are a stocked item -- visit a local shop that specializes in fitting aftermarket wheels and tires to cars. This way, you can play with the wheel and tire size -- and won't be obligated to pay for anything that doesn't fit or look right. Plunking down $2K plus for a set of wheels and tires that don't fit would be a real drag.
Regarding the wheel design -- it isn't my cup of tea, either. The chrome appearance and shape of the spokes is fine. But that lack of any dish doesn't look right. In fact, the hub looks like it sticks out farther than the rim! If that is indeed the case, any contact with a curb is going to result in a $200 repair bill. But variety in life is what makes the planet spin.