Since early Nova's had small wheel-wells and wheel openings, your best bet would be 7 inch wheels with about 3 and 1/2 inch, to 4 inch backspacing. A good example of a wheel that would fit perfectly would be the 15x7 rally wheel off of the early to mid 70's Monte Carlo/Chevelle/ElCamino. But since you're looking for Cragars or Torque Thrusts, both of their 15x7 rims with "standard" backspacing will fit. You could probably go all the way up to 18x7, so long as it has the correct backspacing. Remember, when it comes to wheel fitment...measure, measure, measure. And when you think you've got it right, measure again. It would help if you had a dealer in your area, who has the wheels you want, pull one out of the warehouse for you so you could measure backspace, as well as front. Good Luck
