I found that the fender extension that was on the car when it was blue fit better so I worked with that one. This is what a repop fender and extension fit to the OE valance that was off Curtis' '67 fit like. Not so pretty!
I'm done with the fender to valance fitment. Still need to address the fender to fender extension where there's an inconsistant gap (both sides of the car). I also have modded the center valance support as well, so now everything bolts up nicely with no real pressure...that alone was a huge improvement!
I know for the pro's this isn't a big deal...but for your average drywall guy I feel good about the results!