Keith, I used satin powder coat for the cross member and we used flattened two pack for the inner guards to match the original finish as best we could. See here,
http://fefcholden.org.au/forum/index.php/topic,10350.40.html. I'm sure they were never this good ex factory, but I'm not sure if anyone would want to finish all this as badly as the factory did
.
So, as long as you only use high gloss for the appropriate engine ancilliaries, breathers, pulleys, air cleaner, regulator etc., it should look pretty authentic.
regards
John