WOW... These guys don't know much on dust and colors with dirt!! LOL
As with most dark colors , black, dk blue, red, ect will show dirt very easy!!! As will white.... it shows up just as quick as the dark colors!!!
But the car is yours! Do with it as you will!!! But if you are worried about dirt then a tan or middle ground or some kind of two tone would be pretty cool on it !!! I had a few ol valients with the 198 slant six that lasted forever!!! it was a tan color with black vinal roof, brown interrior, even put some nice mags on it~! so good luck!!!