Overall, that looks good!
Maybe a liiiiiiittle more rubber on the tires, like Krazed's car.
And perhaps lower the roof a couple of inches?
I liked it better with the original front than with the '71 'Cuda front.
Or, how about hidden headlights, like a Charger, keep the bumper as it is, or possibly paint the bumper black?
If only i had space for two more cars, i'd have a comfy C-body and a tricked /6 mid-60's A-body.
I hope you will continue to hang around here, and share your progress with your 66!!