I used 5/8" thick 3x2 spacers in my b body for years. It will change the steering geometry. It was still the easiest fix for installing a crossram and using double pumper carbs that needed 1/2" spacers so the carb would open and close properly. Have your alignment rechecked and a slight steering difference will be noticed. I would do it again in a heartbeat. Arlen Vanke told me that all original hemi dart and cudas used this trick for hood clearance. Good luck