The GTO in that movie was a 1968 GTO with painted rear bumper and 1970 `snowflake' wheels.
http://ultimategto.com/68colors.htm
That's a link to 1968 GTO paint chips and color names/codes. It looks to be either Autumn Bronze or Solar Red. As far as what MM/Tamiya/etc. color it would be, I'm not sure. Hopefully someone else will chime in. Hope that helps a little.
Josh