If you like the look of the Howard's GMC intake, and are looking to keep a "nostalgic" look, why not get the Howard intake and cut off the intake runners and redo them to work with the 292?
It would be alot less work and look more period correct, if that's what you're really after.
Definitely need to make the runners flush with the bottom of the plenum. Just look at all the other intakes out there. Make sure it will clear the exhaust also.
