Good luck with this one, I've heard it both ways and seen it both ways. I have a 77,000 mile 68 SS that someone added a spoiler to when they repainted it, wish they hadn't added the spoiler. It had an emblem removed to add the spoiler. The trunk lid has provisions for emblems with or without a spoiler, cutouts in the inner sheet metal that align with the emblem posts. I put the emblem back on in the upper location just above the spoiler, I like it with the emblem.
A co-worker has a 48,000 all original, unrestored base car with a spoiler and original laquer Corvette Bronze paint. I found it with him and gave him first crack at purchasing it, dumb move on my part but I'd just picked up a 68 RS 3 months prior. I'll look at his car and see what his trunk lid has.