Before you buy those Americans, you should check out Mooneye's "Cast Smothie" they make them in 17", and there is a cool looking yellow 69 camaro on their web page with these wheels. They look similar to the torque thrust, but they are a little different.
4 1/2 will work well with wide profile tires. You can go all the way to 4 7/8 with a low profile tire that doesn't extend past the bead. I have a set of 4 7/8 backspaced 8x15 inch Centerlines that I run on my 68 camaro at the track with a fairly wide profile 28x10x15 tire and they only rub the inside when I turn real hard or put the car in a bind. If you have a stiff suspension with a sway bar you will get less sway and most likely won't have a rubbing problem if you go with 4 3/4 or 4 7/8.
I checked out the Mooneye Smoothie wheels - very cool! They are great looking wheels and the '69 looks awesome with them.
However, they want both your left and right nut for those things! $1200 for wheels alone is just a little too much for even my budget. (I popped for The American TT II's and I'm still getting grief from the wife!)