Over on Nasty Z28 there is a guy who had the correct raised bowtie center medallions for $100/set that can be used to replace the later version chevrolet switched to. If you find complete NOS correct Centercaps last I checked they were $250 each or more, last time I bought NOS centers they were $600 a set... 10 years ago, here are some photos.
IF the photo of the flat bowtie center doesn't show -
here is the direct link - https://photos.app.goo.gl/XwiL9Ty7WTY4SdKY7

https://lh3.googleusercontent.com/pw...-no?authuser=0

IF the photo of the NOS raised Bowtie doesn't show -
here is the direct link - https://photos.app.goo.gl/7qeaTgKhgBgNKXpq9

https://lh3.googleusercontent.com/pw...-no?authuser=0

Member on NastyZ is Budz
This guy:
https://www.ebay.com/sch/14334101/m....88.m1543.l2654
sometimes has correct centers without the emblem, but he doesn't have any listed at the moment. I have NOT purchased any from him, but they look good from his listings.

And as afar as the correct lug nuts, good luck! They are rare as hens teeth and go for about 2 grand a set when you find them.

https://nastyz28.com/threads/origina...-2#post-190523

They are very close to these:
https://www.scottfullerreproductions...29/8316263.htm
but sized for 7/16 studs. I have a die designed for re-sizing them, but just haven't had time to pursue it, if anybodies interested. You would have to buy a set of covers from Scott prior to the coining op and then run them through the re-draw die and then coin over standard lug nuts.

I figure with the cost of the cores from Scott Fuller at 475 and the tooling and time you would be selling a set for 650 or so and thats if you build to tool yourself at cost. How many folks would be interested at this price point?

Added some more Candy on the Nasty Z site. I'm a member over there as well.

$650 a set is not a bad number considering what a set of NOS ones trade for...