A good friend of mine helped a neighbor of his with his new (then) '79 Z28 - wanted to know what he could do to give it some more oomph.
Said neighbor was bucks up - and not overly concerned about warranty.
Tailpipe sniff was not a thing in Michigan until a few years later.
Bought a crate LS6 from Berger in Grand Rapids and after a bit of effort, had it in the Z28 (practically a bolt in from infrastructure standpoint) and running right away.
Was the quickest car in town for quite a while, no idea what happened to it.