I have Ron Morris to move my engine back to clear the blower belt. But not down the 1/2 inch. Joe had a one inch plate milled down to 1/2 that he gave to me in a carb swap that works with my nozzle for the water methanol injection. Below is an early shot before the W/M injection, but I am still using this air cleaner. I actually had to "smash" the top a bit by tightening the nut down to get it under this hood.
This hood provides more clearance than a 68 Shelby hood by at least one inch.
As I remember you are installing a 351 Windsor based block in your car?