[Hooter]

After sitting several years, finally working on the '71 455 for my '74 Firebird. I haven't worked on a stick car for 30 years, so needing some guidance.

The motor was rebuilt back in 2003 by a previous owner. I have the receipts showing the engine was balanced. At that time, it had a flexplate in the receipt, so the 5 speed trans was added later. Started disassembling the motor and noticed it has a stock style cast flywheel(pic). I believe these were externally balanced from the factory. My assumption is this flywheel was neutral balanced when the 5 speed swap occurred a few years later? I need to replace it since the teeth on it are pretty chewed up, so my gut says to order a internally balanced flywheel?

Last question, I'm looking at the RAM billet flywheel. Do I go with the lighter weight 29lb or the regular 35lb. Car is strictly a street car with no plans to take it to the track. 74 Firebird with a TKO500 5 speed. 3.73 gear. 455 with e heads and small hydraulic cam. Old dyno sheet showed 500hp and 550tq. I purchased the motor and trans several years ago from a guy who went LS in his 78 TA.