I have a 1967 Firebird with a 400. I have the parts to install the underhood ram air set up but I' m in need of some guidance in cutting the under hood bracing to install the upper pan. I have the factory parts illustrations showing the bracing but it refers to a template. Is there a template out there I could use? If not, how did you guys measure for the cut? I absolutely don't want to make a mistake cutting on the hood. Thank you for any help.