How much does temperature affect motor?

14-15 timing should be close enough to tune that engine as long as the cam isn't something crazy.

Be VERY careful with the needle and seat. Your carb has the thread killing jiffy kit N&S set up in it. The normal kit locks with a screw on top, not with the nut. Easy to over tighten that nut and pull the assembly up, tearing threads in bowl.

Make sure fuel isn't dripping into your venturis while the car is idling.