Tire type/quality vs sizing?

[INTMD8]

I'm at the point where I need to buy some tires. I need them to be close to 29in tall so they look correct on the car (57 Cadillac). It will be around 5000 pounds and utilizing a Roadster Shop chassis with front/rear sway bars.

It's not going to be raced but handling is definitely a concern.

This is what I'm considering.

Michelin Pilot super sport

Front- 245/45/20 28.7 diameter

Rear- 315/35/20 28.7 diameter

Now I would rather not have so much width difference between the front and rear but these are the only 2 tires in this model that are enough/same height.

I could tighten up that difference by using Continental Extreme Contact DWS.

Front- 255/45/20 29 diameter

Rear- 295/40/20 29.3 diameter

Any thoughts on this? I'm thinking that even with less than ideal widths the car might still work better on the PSS's over the DWS's of what I consider better sizing.