Unfortunately, you’re not going to have much of a choice. Finding a TH400 dipstick tube is almost impossible. It’s not the engine that’s the problem, it’s the Firebird.
Also, the kick down switch on the TH400 is electric. You can attempt to find an original kick down switch if you’re using a Quadrajet (good luck and $$$$). I was using a Holley and found the B&M set up to work well.
Last edited by Bronze Bird; 04/27/2105:41 PM.
I'm a hobbyist. Not a professional. Don't be hatin'!