underside paint choice

Glad you posted the picture I see you painted rear tire wells and otuside the rear frame rails black. That's exactly what I was considering

I agree.

When you see body color through the front grille and behind the tires it looks distracting and bad. Seeing bright body color behind the grille and tires looks confusing to the eye and takes away from grille and rim/tire combo.

I don't care if it's a race car, modified show car, OE stock resto, or whatever. Still looks bad.