my hood is a fibreglass 400 .there are no emblem holes in it and i know the spacing is different between the 350 and 400 emblems.so i can place them where i want as to get the best fit,just want to try and get them close to where they should be.
since I havent seen the underside of a fiberglass hodd, I may be off , but make sure whereever you drill holes you can get the studs at least 1/2" clearance from braces etc ,so you can get a nut on , plus a wrench!
I made that mistake on one stud on my rear Camaro Spoiler and 400 emblem!