Here is a link to Coker Tire and the Pro Trac line. They offer two front runner sizes. Not sure if the 560 would be big enough to fill out the Nova opening, but it's the one they recommend for your rim size.
http://www.cokertire.com/catalogsear...lt/?q=pro+trac
On a side note: The picture in their ad on the 560 page, of the Pro Tracs mounted on the Cragar S/S rims, are my Vega wheels and tires.