73 was the only year you could get a formula L75 455 and a 4 speed, and nearly
all of them were M21 Muncies. Total produced was 227. PHS is needed to confirm
both the 4-speed and the RA, but the Vin Number does indicate the Formula 455.
with the 503 Autos (most T400) the total for 73 was 730 Cars. The other option
to look for is the Y99 suspension upgrade. Cars with this option have the same
running Gear as the Base Trans-Am in 73. (SD's are a different animal)
I have one of these and they are indeed very rare, and most are highly optioned
with 20 or more not uncommon. If this is a Numbers matching 4-Speed RA Car
I think the price is very reasonable, but PHS is a requirement for this one as others
have noted.
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