I'm installing some headers on my 1969 Caddy hearse with a 472 motor. I'm having a hard time locating HEADER gaskets for the 472. I purchased some regular Felpro manifold gaskets but these won't do. Standard bolt pattern Some have suggested just using high temp RTV. I know Cad Company has the individual gaskets but I'd like one solid one per side if possible. Jc Whitney lists some made by SCE but the bolt pattern is not right. Thanks.