Local support needed

[Boggie]

Just registered as a first time owner with a sad situation. Sorry if I'm injecting myself into a stream, but I bow in humiliation and ignorance of the site, O Wise Ones. I'm second owner, 1981 Bowling Green machine. Necessity drove me to a local merchant about a mile away that is not Corvette specially. As it developed, I needed valve work done, following a carb rebuild and shorty headers. After bringing it home, driving it for several, an associate said there was a knock. Took back to merchant who promptly said "Yep! See ya" I need a corvette person in my area to share their wisdom concerning the problem. Help. any suggestion. I've invested $$$$ and would hate to...@31%34 it.