Looking great Steve! As said before, Kurt does aswesome work...you're in good hands!!
I think you will like the fitment of the 315 on your car...a 335 on a 67-8 needs fender lip work as the fenderwell is a little narrower than a 69. I opted for the 315 on my car as I wanted the lips untouched and the 315 is a better match for the 245 front tire.
Have fun with all the upgrades, it will really change the car!!