Vintage Air in a Non-Air Car - Value?

[nugemo]

I recently picked up a 1967 RS/SS 350 4sp convertible - I want to add vintage air to the car and have done my research on that. I am ready to do the install but I am getting conflicting info on what it will do to the value of the car. I am told that I can add the astro ventilation (cut the holes) In the dash and it will not devalue the car any as there is no true tracking of what cars had and didn’t have these holes - Any feedback is appreciated. I don’t think adding the holes is a good idea, but if it won’t de-value the car I am ok -

[1970cuda]

if you are restoring it concourse condition then sweat away. if you are building it to enjoy then do the vintage air. those cars are bring stupid money no matter the condition. it you are worried about modifying the car maybe you should be on bonestockcamaros.com or camarosingaragebubbles.com and not on this site.lol
just keep all the stock stuff so if you want to return it to stock you can