Nice looking Duster! I understand about you wanting to paint it Moulin Rouge.
A friend of mine ( now deceased) owned an original '71 340 4 Speed Duster.
His car was B3 light blue when new, and that's how he bought it, just out of high school. But after a few years...
He built up the 340 to about 550-575 H.P. put in a 6 point bar, then painted it FC7 In Violet purple 🟣 with the correct 340 stripes.
It was a street car, but with a roller cam and 3" inch exhaust, it was a wicked car!
Good luck on your Duster!