th350 isn't weak, and is more than fine for your Pontiac 350 2 bbl. with 2.56's in a Firebird. I have the same combo in my 75 Lemans Sport(although I converted it to a Q-jet), which is a bigger, heavier car than your 69 Firebird. The transmission is original with 170K miles on it and still working fine.
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Steve F.
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