[Mr70]

074's are correct for the 1969 L-88 Corvette,1969 Zl-1 Camaro & Corvette,& 71 LS-6 Corvette also.
842's are correct for the 1968 L-88 & L-89 Corvette,1969 L-89 Corvette,1968-9 L-89 Chevelle & Camaro,1970 L-89 Chevelle.