Zero. There were no Formulas until '70. 7,708 of those.
Rpm Red line 1968 Pontiac firebird 400 HO
We would have to have alot more information. You are probably in the 350hp range if you have a 400 block.
Pontiacs did not have "big" or "small" blocks. Your '68 could have come with a 350 or a 400 cubic inch motor.
There is no Big block or small block in Pontiacs. They were the same size. "67 did have the 400 and 400 HO available for the Firebird.
Zero. There were no Formulas until '70. 7,708 of those.
Call Autozone, Advance Auto, Or Napa. They can order a manual for you. A Haynes manual, or a Chilton. They usually run Under $20
front drivers side
firebird 1978 400 engine pontiac
over 400 have been made
3:42
400-387=......................................................