I checked my red ones and green ones that have letters "H.O" on the white side stripes. I think 400's with factory H.O package is very rare that came out in 1967 and 1968 only. The Formula package came out from 1970 and up Firebirds, with factory Formula twin hood scoops not Trans Am package. In 1969 Trans Ams have factory twin long hood scoops with Ram Air package is not a formula package but that's similar to 1970 and up Firebird Formulas. I'll take some of pics of my six 1967 Firebirds 400 with H.O white side stripes then I'll post pics here for you to viewing them soon.
This is my old pic of '67 1/2 Firebird (7/27/67) w/ '74 Pontiac 400/400 on Jan 1st, '90. She had original Tyrol Blue Ext. with Std. Dark Blue Int., 326 2bbl, 4spd, 2 traction bars, 1 of 6,078 built in '67. I'm the current owner of '67 Firebird 400 coupe with original code F-400 Option, 1 of 22,636 built in '67 with rare T400. My brother & I picked her up and brought her to my new home. It's original eng. & trans. are long gone. Has factory K-Gulf Turquoise under primer, had Ivory vinyl top. Has factory RH traction bar w/ 3.08 gear, J-custom option with original Deluxe Parchment Int., has rare fold down rear seat. I'll look for a good running '67 400/400 when it's done. Check out my pics - Photobucket.com - Pat's 2nd '67 Firebird 400 Project 2/3/13
![[Linked Image]](http://i1378.photobucket.com/albums/ah93/Mr_Mego/My%201967%20Firebird%20400/MyClean67Firebird%20-%20Copy%20-%20Copy%20-%20Copy_zpscysk4iyv.jpg)
