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Unless I am sadly mistaken, Pontiac built zero. The 455HO (round port heads) were never made again after the 1972 model year. In 1973 and 1974 the Hi-Po 455 was the Super Duty which was offered in the Formula, but is very rare as a factory build. The late 70's "HO" used d-port heads. I currently own a '72 Formula, and have bought and sold several '70 - '72 Firebirds, Formulas, and Trans Ams stating over 30 years ago.

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Q: How many 1973 firebird formula 455 ho 4 speeds were built?
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