That 6 cylinder OHC engine is rare if it's original to black Firebird is good.
I'll come back and checking on it with new pics when you're finished job on her.
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