Legit Formula 455 cars are few and far between for each of the four model years they were offered:
1971 -
671 total (350=L75/M40, 3=LS5/M13, 163=LS5/M22, 155=LS5/M40)
1972 -
276 total (no breakdown available for manual versus auto cars - they were all LS5 cars, as L75 Formulas were built this year)
1973 -
773 total (227=L75/M22, 503=L75/M40, 10=LS2/M22, 33=LS2/M40)
1974 -
760 total (I have no breakdowns further than this: 702=L75, 58=LS2)
(FYI - L75 = 'D' port 455 / LS5 = 455HO / LS2 = SD455)
I would suspect that all legit L75 Formulas are a little undervalued right now - they were better performers than either the '75 or '76 L75 T/A's, and how many times have you heard how few '75-L75 T/A's were built? (I've heard it plenty & there were more built than your car!) The '76 L75 T/A's demand a premium and there were
only about 7000 built...
The prices previously stated are probably correct for where they are sitting right now... but with this ongoing upward price trend (and the buying public finally realising that the '74-76 Firebirds are overlooked) I'd expect them to go up too...
Here's a link you might be interested in...
http://cgi.ebay.com/ebaymotors/Ponti...QQcmdZViewItem
I hope this helps!
Jonathan