The 1968 Camaro Assembly Manual shows their hoods were pre-drilled with a pair of holes for the lamp (in two different locations depending on the engine). Differences in the Camaro and Firebird hoods may not make the locations in the Camaro documentation applicable for you but the possibility of pre-drilled holes might help. I cannot see if my '68 has any drilled holes because of a hood insulation pad but you might check yours if you are using a factory hood.