Since this is the Concours site
Then rtv and non-white intake gaskets would not be original or correct for the car and if shown would equate to points lost
Since I recently did my 69 Boss I choose to paint the gaskets to being them back to the original look (adding the lines and markings to the surface) and the cork end gaskets. Since I painted the engine with the intake on like originally the slight amount of overspray from under and around the mask tended to cover the outer edges of the gasket material anyway
Pictures of this are posted in that build thread
Hope this helps