Hi, I am a professional certified mechanic, with an engineering background, and 35+ years experience. I will do my best to assist you. Also keep in mind I don't know if you are a pro or a novice, so feel free to add any additional info at any time.
There are two things wrong with a 153 tooth flywheel on this engine. #1 it will knock the engine out of balance, it will vibrate like the devils own jack hammer pounding the downtown streets of hell, LOL. I mean real bad. Next the starter you need for the 327 block wont mesh with the 153 tooth flywheel, so the starter will kick out and just go zinggg, but wont turn the engine. You need to totally get rid of the 153 tooth flywheel, and get a 168 tooth flywheel, and the matching stock block mount 66 model 327 starter.
Go over all of this and if you have any more questions at all, I am here to help. Good luck with it, have a great day, and Thanks for using Just Answer.
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