Its worth what your willing to pay for it. Thats all that matters. If you can get it for a price you can live with. (DO IT) The price of these first generation Novas are going up everyday. If the body is clean and straight thats all the better. 15X7 with 4.5 backspacing will fit fine with 235X60X15. Its a 65 so it should have five lugs. As far as what I would look for is rust anywhere on the car. Areas - lower quarters and wheelwells - bottom of doors - lower rear door. Pull the carpet back some and check the floors and trunk areas for pin holes. check below and around the battery tray. Check for slop in steering. I would jack up the car so the front wheels are off the ground and check for play. I would do the same with the rear. But if it was me the only thing I would be really concerned about is how clean and straight the body is. Body work is costly if you can not do it yourself and most of of can not. We can swap motors and trans all day but can not even fix a small dent to our own liking. Just my opinion. People who can do body work correctly and fab. sheet metals are gods in my eyes.