I don't know if this will help
7929-16 Standard Length Ford '62-'69 221-302 5/16” / .080” 6.800”
7930-16 +.050” Long Ford '62-'69 221-302 5/16” / .080” 6.850”
7933-16 +.100” Long Ford '62-'69 221-302 5/16” / .080” 6.900”
7930-16 Standard Length Ford '68-'85 255 and 302 5/16” / .080” 6.850”
7935-16 +.100” Long Ford '68-'85 255 and 302 5/16” / .080” 6.950”
Small Block Ford 7997-16 -.050” Short Ford '69-'78 351W 5/16” / .080” 8.100”
7965-16 Standard Length Ford '69-'78 351W 5/16” / .080” 8.150”
7966-16 +.050” Long Ford '69-'78 351W 5/16” / .080” 8.200”
7945-16 Standard Length Ford '70-'74 351C and Cobra Jet 5/16” / .080” 8.400”
7975-16 +.050” Long Ford '70-'74 351C and Cobra Jet 5/16” / .080” 8.450”
7976-16 +.100” Long Ford '70-'74 351C and Cobra Jet 5/16” / .080” 8.500”
7976-16 Standard Length Ford '71 and '72 Boss 351 5/16” / .080” 8.500”
7932-16 Standard Length Ford '71 and '72 Boss 351 3/8” / .080” 8.500”