I've used a piece of a stainless butter knife to block the crossover on a Ford FE intake. You can use a die grinder to bevel the intake to fit the plate flush snugly. Then some hi-temp sealer to hold it in place till intake is installed. Some will just use sealer and not seat the plate but I like it to sit flush. Also heard of drilling a small hole in the plate to release any buildup of heat but have never tried that one myself. BTW the butter knife trick is really old school. LOL, G.