There were (4) 351C packages available, 3 with the 4 barrel and giant ports
351cid 2V V-8 240 hp H Code
351cid 4V V-8 280 hp Cobra Jet Q Code
351cid 4V V-8 285 hp M Code
R-code (Boss 351)?: The Boss 351 is a high-performance variant available only in the 1971 Boss 351 Mustang. Rated at around 330 hp
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