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I can't vouch for c3 boosters, but I've used rock auto many times for rebuilt C5/6 boosters with no problems. That said, I'd also get one of these: https://www.cssbinc.com/1968-76corve...tmenttool.aspx They also sell boosters
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
the problem you will have is whether or not the cylinder pin from your replacement booster will fit inside the master to give you the needed gap that is measured with the CSSB inc tool. Its not more expensive but I suggest getting the booster and master as an assembled unit. THe best one I have bought and have never had an issue with is from tuff stuff. THat being said I have bought alot of other brake parts from CSSB an they are all top notch. Both are made in the USA and are about the same cost . If you want just the booster then this is the 76 model, looks like it might be out of stock https://www.cssbinc.com/1968-76corve...ter338906.aspx
if you want the Tuff stuff combo. This is what I have and you will not have any issues, just bleed the master and bolt it in. And summit stands behind their stuff as well as TuffStuff https://www.summitracing.com/parts/tff-2129nb