yeah, i'm surprised the factory didn't offer this combo either, you'd think even in the 70's black/red/silver would have been a popular combo. they allowed some pretty ugly combos back then!
i bought the car with the intention of painting it silver, my first t/a in high school was a silver on red 78 w72 t top t/a. i REALLLY miss that car & absolutely love that color combo (my fav for a t/a) after tons of contenplating what to do, i decided to keep the car black since it was a low mile #'s matching car, i even bought the gold decals...but at the last minute i asked brett if i could exchange the decals for the charcoal/red ones & decided to make it a custom combo that sort of resembled my old silver t/a. again, i am very happy with the results & like you, i lost count of the compliments i get on it.
i would not have any problem with you doing the same color on your car, it would be different since you have black interior. if mine was black i would have went with the gold decals, it's the red interior that made me decide against the gold. FWIW, i would keep your blue if thats the original color, it is a nice looking combo.
also, my color combo is not unique, i have seen one or 2 others this color but not with the 8" silver snowflakes & they were alot rougher with black interior, they didn't stand out quite like mine does.
here's a pic of my old silver t/a, one with my x girlfriend, sure do mis her......the car that is!