Welcome to First Gen Firebird.

My 400 HO Convertible is a 09D built car built the week before yours. You want to find an intake G or H date. Your head date is real early, earlier then I would expect but may be correct. What in the number on the center exhaust? I have been trying to gather the correct dated parts for mine and I use G or H or J depending on what I can find. MY distributor and heads are H. The carb is dated by the day so my carb is 216 of 67 it looks like 2167. You will have to look for a Day Julian calendar for 67 to come with a day before yours was build.

Check out www.firebird400ho.com and register your car in the registry.