["Guy]

Skip, One of my biggest concerns was using a RPM intake with my engine build. But also I wanted the stock ram air set-up for '68....and close the hood without making the foam base to hodd plate flatter than thinnest pancake. The fix was to channel the steel...yes steel stock ram base by an 1-1/4" inside, behind the air cleaner. IT WORKED PERFECT!!! I can run a 4" high K&N air filter I still have an 1-1/2 clearance with the hood closed the foam seal just touches the hood plate....which now opens the door to a phenolic spacer up to an inch in height. I don't know if I'll need the spacer with Cliff Ruggles 850cfm Qjet on the 406 vs. the current 750cfm Qjet. I have some tuning to do....can't wait to have doing that again! My car will be done for sure in the next couple months....sweet!
one other thing....you have to fab or modify the throttle cable bracket to clear the base coming down lower on the intake. I had to trim the throttle bracket posts and I put a 90 deg bend in the stock 68 throttle bracket...whew.
Also look at the post Jim Hand did with the pictures of his air box set up....only thing I would suggest Jim do is get the air cleaner top further away from the carb top than it is and run a 4" high air cleaner element...
Guy