A 10D build date would not have had a cowl hood offered that early in production. I believe it wasn't offered until late in December and very few cars actually got them, compared to what you see today, everybody has one. I prefer the SS hood with the grilles in them, but not with the stripes running through them that just doesn't look right to me. Only Camaro to have the emblems on the hood were the Yenkos and 302 cars. No the 350 emblem is a different style and size. The 302 hood emblems were kind of a unique size, not like the fender emblems. Your black molded grill is correct for your SS, no Z28s ever came with a black grill except for rally sport cars, but you see a lot of bogus cars with Z28 emblems and grilles painted black. You are right the SS grill is molded black not painted. Your tail panel emblems will interchange using the same holes. Sounds like you have a nice SS, I agree with your decision to keep it an SS.